Search this question and you’ll get a dozen lists of things that supposedly disqualify you from dental implants. Diabetes. Osteoporosis. Gum disease. Smoking. Being over 70. Almost every one of those lists is out of date, and it’s not hard to show where they came from.
Most of them descend from a generation of contraindication lists written in the mid-2000s, the best known being Hwang and Wang’s 2006 paper in Implant Dentistry. The systematic review that usually gets cited alongside those lists, by Diz, Scully and Sanz in the Journal of Dentistry in 2013, reached nearly the opposite conclusion: there are very few true absolute contraindications to implant therapy, and how well a condition is controlled matters far more than whether you have it. Nobody updated the listicles.
We’ve been placing implants and building teeth in Oregon for more than 40 years, through 40,000+ restored smiles, with a laboratory on site at every one of our four locations. In that time we’ve told a fair number of people to wait. We’ve told very few that the answer is no forever. This post explains the difference, what your provider is actually measuring, and what to do if someone has already turned you down.
Who Is a Good Candidate for Dental Implants?
Quick answer: If you’re missing one or more teeth, have enough jawbone to hold an implant or can rebuild it, have gum tissue that’s healthy or treatable, and you’re well enough for a minor oral surgery, you’re a candidate. That describes most adults with missing teeth. Age isn’t a barrier, and neither is a managed chronic condition.
An implant is a titanium post placed into the jaw, where bone grows onto its surface and locks it in place. That process, osseointegration, is the whole ballgame. Everything a clinician checks before saying yes is really a question about whether your bone will do that, and whether it will keep doing it for twenty years.
So candidacy comes down to four things:
- Bone, in enough volume and quality to hold the post
- Soft tissue healthy enough to seal around it and stay sealed
- Systemic health good enough to heal a small surgical wound
- Willingness to maintain it, because implants get gum disease too
That last one gets skipped in most articles and it shouldn’t. An implant can’t decay, which is why people assume it’s maintenance-free. It isn’t. It’s a tooth-shaped thing in a gum pocket, and gum pockets need cleaning.
What Actually Disqualifies You From Dental Implants?
Quick answer: Very little, permanently. When we work through a patient’s history, almost every concern sorts into one of three answers: never, not yet, or not like that. The “never” pile is nearly empty. The other two are where real life happens, and both of them end with teeth.
We use this sort out loud with patients, because it changes the conversation from a verdict into a plan.
Genuinely permanent no’s are rare. The clearest one in the literature is active cancer treatment with high-dose intravenous antiresorptive drugs like zoledronate, where the American Association of Oral and Maxillofacial Surgeons’ 2022 position paper is explicit that implants should be avoided. A few situations involving uncontrollable bleeding disorders or a medical inability to tolerate any elective surgery belong here too.
That’s close to the whole list. If a website tells you nine conditions permanently disqualify you, it’s reading a twenty-year-old list that the research since has steadily walked back.
This is the big pile, and it’s the one most people land in. Untreated gum disease. Blood sugar that isn’t under control. A jaw that hasn’t finished growing. A recent heart attack. An extraction site that needs a few months to settle. None of these are refusals. They’re a sequence: fix this, then we place.
The honest version of “not yet” comes with a date attached. If nobody can tell you roughly what has to change and how long it’ll take, ask again.
Sometimes the standard plan won’t work but a different one will. Not enough bone height above a nerve for a 10 mm implant? A 6 mm implant may do the job. Not enough width for a standard post? A narrow one might fit. Not enough bone anywhere in the upper arch for a fixed bridge? Four implants holding a removable overdenture will still get you chewing comfortably again.
Being told “you’re not a candidate” often means “you’re not a candidate for the one procedure I offer.”
How Much Bone Do You Need for a Dental Implant?
Quick answer: There’s no official minimum. The numbers you see quoted, usually 6 mm of width and 10 mm of height, are working conventions from review articles, not thresholds set by any consensus body. What is agreed on is the buffer: the International Team for Implantology’s 2023 consensus recommends more than 1.5 mm of bone on the cheek side of the implant, which for a standard 4 mm post works out to a ridge around 6.5 to 7 mm wide.
That buffer is worth understanding, because it’s the part of this that clinicians broadly agree on. The systematic review behind the ITI statement, led by Alberto Monje and published in Clinical Oral Implants Research in 2023, couldn’t pool its 16 studies because they varied too much. One prospective study inside it found sites with less than 2 mm of facial bone lost 2.34 mm of height, against 0.31 mm where the wall was thicker. Indicative rather than settled, then, but pointing the same direction as the rest: thin bone doesn’t fail immediately, it recedes, and the implant shows.
Height gets measured against what’s underneath. In the lower jaw that’s the inferior alveolar nerve, and the convention is to leave 2 mm of clearance, a rule Gary Greenstein and Dennis Tarnow laid out in their 2006 Journal of Periodontology review of the mental foramen and nerve. Their reasoning is as much about imaging as biology: panoramic X-rays in their review were off by an average of 3 mm, CT scans by 0.2 mm. The margin is there to absorb measurement error. It’s also why a flat panoramic film is not enough to plan an implant, and why any practice quoting you an implant plan without a 3D scan is guessing.
What about bone quality?
Bone gets graded 1 to 4 on a scale Ulf Lekholm and George Zarb published in 1985, from dense compact bone down to a thin shell around loose, low-density interior. (You’ll see “D1 to D4” used interchangeably online. That’s Carl Misch’s separate density scale. Different system, frequently conflated.)
Type 4 bone does worse. A systematic review by Marcelo Goiato covering 12,465 implants found 88.8% survival in type 4 against 96 to 97.6% in the denser grades. Before that number scares anyone: within the soft-bone group, modern surface-treated implants survived at 97.1% while old machined-surface implants managed 91.6%. Most of the penalty belongs to implant surfaces that nobody has used since the 1990s. A later meta-analysis by Bruno Chrcanovic confirmed that softer bone still fails more often even with modern surfaces, so the fair statement is that soft bone asks for a longer healing runway, not that it rules you out.
And nobody can tell you your bone type from a photo or a standard X-ray. It’s assessed partly by feel, during drilling. Any page promising to tell you whether you qualify based on a percentage of “bone density” has invented a measurement that doesn’t exist.
Can You Get Dental Implants If You’ve Already Lost Bone?
Quick answer: Usually, yes. Bone loss is the single most common reason people are told no, and it’s the reason with the most workarounds. You can rebuild the bone, or you can use a shorter or narrower implant that fits what’s already there. Both routes have five-year and ten-year evidence behind them.
Losing bone after losing teeth isn’t bad luck, it’s the default. A systematic review by Wah Lay Tan in 2012 found the ridge loses 29 to 63% of its width and 11 to 22% of its height within six months of an extraction, most of it in the first three. Over decades it keeps going, and unevenly: Aina Tallgren’s 25-year study of complete denture wearers, published in 1972, measured the front of the lower jaw shrinking about four times faster than the upper, roughly 0.2 mm a year against 0.05. Her study followed 20 women wearing mid-century dentures, so treat it as the shape of the problem rather than a personal forecast. The shape is right, though, and it explains why lower dentures get loose while upper ones mostly don’t.
Here’s what the routes actually look like.
| Route | What it involves | Added time before final teeth | What the evidence shows |
| Short implants (6 mm or less) | No graft. A shorter post placed in the bone you have, usually in the back of the jaw | None | ITI’s 2018 review of 10 trials found 96% survival against 98% for longer implants, a difference that wasn’t statistically significant. Daniel Thoma’s 10-year randomized trial found 96% survival for short implants versus 100% for grafted sites, with peri-implantitis in 4.2% of the short-implant group against 13.3% of the grafted group, a gap that didn’t reach statistical significance in a trial of this size |
| Narrow implants (3.0 to 3.5 mm) | A thinner post where the ridge is too narrow for a standard one | None | Eik Schiegnitz and Bilal Al-Nawas reported 97.3 to 97.7% survival, no significant difference from standard diameters. Implants under 3.0 mm dropped to 94.7% and are mainly used to retain overdentures |
| Sinus floor augmentation | Graft material placed under the sinus membrane in the upper back jaw to create height | Several months, depending on graft material | Gerry Raghoebar’s 2019 meta-analysis of patients with 6 mm or less of remaining height found annual implant loss of 0.43%, around 97.9% survival at five years |
| Ridge augmentation | Bone graft, often with a membrane, to widen a thin ridge | Typically 4 to 6 months if staged | Ignacio Sanz-Sánchez’s 2015 review found width gains averaging 3.9 mm and implant survival above 95% in the rebuilt sites. Grafts that stayed covered gained up to 3.1 mm more than those where the membrane became exposed |
One thing stands out in that table. Grafting works, and it’s been working for a long time. When we can avoid a graft, we usually do. When we can’t, we say so and we tell you the timeline before you commit.
Does Gum Disease Mean You Can’t Get Implants?
A 2024 systematic review by Matteo Serroni found that people with a history of periodontitis developed peri-implantitis at roughly four times the rate of those without, and lost implants at more than twice the rate beyond the five-year mark. The authors rate that evidence low-certainty, which is worth knowing, though the direction is consistent across studies. An implant is more vulnerable to this than a natural tooth, because the gum seal around an implant is a weaker structure than the one around a root.
None of that is a reason to give up on implants. It’s a reason to treat the gums first and then keep to a cleaning schedule afterward. Ongoing professional maintenance is the one thing that guideline backs with its strongest grade of recommendation. If you’ve lost teeth to gum disease, you’re not disqualified. You’re a patient who needs a maintenance plan alongside the implants, and we’ll build one with you.
Can You Get Implants With Diabetes, Osteoporosis, or on Blood Thinners?
Quick answer: In nearly every case, yes. The published evidence on all three is much more reassuring than the internet suggests, and for two of them the honest answer is that the condition makes essentially no difference to whether an implant survives.
Diabetes
Control matters, the diagnosis doesn’t. Thomas Oates and colleagues, writing in JADA in 2014, followed 234 implants and found one-year survival of 99.0% in patients without diabetes, 98.9% in well-controlled patients, and 100% in poorly controlled ones, with no significant difference between groups, though only 19 patients were in that poorly controlled group. What poor control did affect was early stability, which took longer to develop. A 2022 review by Wagner and colleagues reported survival of 100% in patients whose HbA1c sat at 8% or below, against 95.4% above it, and concluded that diabetes isn’t a contraindication when it’s controlled.
If your blood sugar is running high, the plan is to work with your physician first and place later. That’s a “not yet” with a clear finish line.
Osteoporosis and bone medications
Osteoporosis itself does not affect implant survival. A 2025 meta-analysis by Kim and colleagues covering 3,774 implants found a relative risk of 1.00, with no variability between studies at all. That’s about as flat a result as this literature produces.
The worry people actually carry is the medication. For osteoporosis-dose drugs, the numbers are much smaller than most people expect. The AAOMS puts the risk of medication-related osteonecrosis of the jaw for patients on oral bisphosphonates at under 0.05%, and 0.3% for denosumab at ten years. A 2025 systematic review led by Mirza and colleagues found no detectable increase in implant failure among patients taking these drugs. It did find a small real increase in osteonecrosis risk, on the order of three extra cases per 1,000, so the risk isn’t zero. It’s small enough that the international task force reviewing the same evidence stated plainly that antiresorptive therapy doesn’t need to be stopped before implant surgery. Stopping denosumab, in particular, carries its own risk of rebound bone loss.
High-dose intravenous antiresorptives given for cancer are a different medication in a different dose for a different purpose, and that’s where the real prohibition lives. “You take Fosamax so you can’t have implants” confuses the two.
Cancer treatment and radiation
Radiation to the head and neck does reduce implant survival. A 2021 meta-analysis led by Toneatti and colleagues found 91.9% survival in irradiated jaws against 97.0% in non-irradiated, with osteonecrosis of the jaw occurring in 3.0% of cases. Waiting more than twelve months after radiation improved outcomes. You’ll see 50 Gy quoted as a danger threshold; that analysis found no dose effect even above 60 Gy, so treat that number as commonly repeated rather than settled. This is a case for coordinated care with your oncology team, not an automatic no.
Blood thinners and immune conditions
Anticoagulants don’t disqualify you, and stopping them usually creates more risk than it removes. Dawoud and colleagues’ 2021 review of more than 1,400 patients found more bleeding events in patients who continued their medication, but clinically insignificant ones, managed with local measures. Across the whole dataset, two people needed hospital care for bleeding: one on anticoagulants, one not.
Immunocompromised patients also do better than the old lists imply. A 2019 meta-analysis by Florian Duttenhoefer reported implant survival of 93.1% in patients with HIV, 98.8% after chemotherapy, and 100% in organ transplant recipients, though that last group was only 16 implants. The one real signal was Crohn’s disease, where early failure odds were eight times higher.
Does Smoking Disqualify You From Dental Implants?
Quick answer: No, but it’s the biggest modifiable risk on this page and we won’t pretend otherwise. Smokers lose implants at roughly 2.4 times the rate of non-smokers and lose about half a millimeter more bone around the ones that survive.
Those figures come from the largest analysis available, by Mustapha and colleagues in Medicina in 2022, covering more than 150,000 implants. The odds ratio for failure was 2.402, and marginal bone loss was 0.58 mm higher. A 2026 review in Clinical Oral Implants Research led by Elena Calciolari found the same pattern and stated directly that smoking is not an absolute contraindication, while recommending that cessation support be built into the treatment plan.
Does quitting before surgery help? Probably. The evidence is thinner than the confident advice suggests. The widely repeated protocol of stopping one week before and eight weeks after comes from a single 1996 study by Craig Bain of 78 patients treated by one surgeon, in which quitters ended up statistically indistinguishable from people who never smoked. That’s an encouraging result and a small one. No trial has tested those specific windows since.
Vapes, heated tobacco and nicotine pouches: Calciolari’s team found insufficient data to say anything. Anyone telling you vaping is safe for implants, or that it’s just as bad, is ahead of the evidence.
Are You Too Old, or Too Young, for Implants?
Quick answer: There’s no upper age limit. ITI’s consensus statement puts it flatly: advanced age alone, meaning 75 and over, is not a contraindication. A 2025 meta-analysis found three- to five-year survival of 96.8% in patients over 75, significantly better than the 92.1% recorded in the 65 to 75 group.
It isn’t unanimous. Howe’s ten-year survival review found age over 65 predicted more failures, and the patients in those over-75 studies were selected and closely followed, which is part of why they did so well. The practical reading: age itself isn’t the barrier. Health and maintenance are.
The lower limit is real, and it isn’t about birthdays. An integrated implant behaves like an ankylosed tooth: it stays put while the jaw around it keeps growing, so the crown gradually sinks below the neighboring teeth. Spyridon Papageorgiou’s 2018 review found this in half of implant restorations placed in natural dentitions, by an average of 0.58 mm, and by more than a millimeter in one in five. The patients in those studies averaged 42 years old at placement. Facial growth never entirely stops, which is why waiting for skeletal maturity reduces the problem without eliminating it, and why implants in the front of a teenager’s mouth get planned carefully or postponed.
What If Someone Already Told You You’re Not a Candidate?
Quick answer: Get a second opinion, and get it from somewhere that does its own lab work and its own surgery. A large share of the people who come to us for a second opinion were turned down for bone loss that a shorter implant or a graft could have handled, or were quoted a plan built around one technique that one practice happens to offer.
Our second opinions are free, as is your first visit. There’s no obligation attached to either. We’ll take the scan, look at what’s actually there, and give you the sort: never, not yet, or not like that. If the answer is “not yet,” you’ll leave with the sequence and the timeline. If it’s “not like that,” you’ll leave knowing which alternative fits, whether that’s implant-supported dentures anchored on fewer posts, a partial denture that protects the teeth you still have, or a conventional full denture built well enough that you stop thinking about it.
And if the answer is yes, everything happens under one roof: extraction, grafting, placement with sedation available, and the final teeth crafted in our own Oregon laboratory. Single implants start at $1,000. Healing runs on what we call the three clocks of implant healing: days for the surgical site, six to eight weeks for the gum seal to form, and two to six months for the bone bond. So the full process usually takes three to six months without grafting, and roughly four to six months longer if you need a staged graft first. You won’t go without teeth while you wait.
Frequently Asked Questions About Dental Implant Candidacy
What percentage of people aren’t candidates for dental implants?
No one has published a reliable figure, and any specific percentage you find is invented. What the research does show is that implant use is climbing fast: a 2018 analysis of national survey data by Elani and colleagues found the share of American adults with missing teeth who have implants rose from 0.7% in 1999 to 5.7% by 2016.
Do dental implants last?
The best long-term evidence, a 2019 review by Howe and colleagues in the Journal of Dentistry, puts ten-year survival at 96.4%, or 93.2% in a stricter analysis that accounts for patients lost to follow-up. Be skeptical of the “98% success rate” figure that appears on so many dental sites. Nothing at meaningful follow-up supports it.
Can I get implants if I’ve worn dentures for years?
Often, yes, though the arithmetic changes. Years of denture wear mean years of ridge resorption, so there’s usually less bone to work with than in someone who lost teeth recently. That pushes more people toward grafting, shorter implants, or an implant-retained overdenture rather than a fixed bridge. The lower jaw is where implants tend to make the biggest difference, because that’s the ridge that shrinks fastest and the denture that goes loosest.
Does teeth grinding rule out implants?
No, but it changes the design. Birgitta Häggman-Henrikson’s 2024 meta-analysis found roughly double the failure odds in probable bruxers. Older reviews disagree about whether grinding causes biological failure at all; Daniele Manfredini’s 2014 review found no clear link to implant loss, only to mechanical problems like screw loosening and chipped porcelain. Grinding is something we plan around with a night guard and the right number of implants.
How long after an extraction can I get an implant?
Anywhere from the same day to several months, depending on the site and whether there’s infection. Waiting has a cost, since most of the ridge shrinkage happens in the first three months, which is why bone is often placed into the socket at the time of extraction to hold the shape.
Will insurance decide whether I’m a candidate?
Insurance decides what it pays for, not what’s clinically possible, and the two get confused constantly. Plenty of people are told they aren’t candidates when what they were told is that their plan won’t cover it. We’ll walk through financing separately from the clinical question, and we keep them separate on purpose.
Do I need a bone graft?
You’ll know after a 3D scan, not before. Grafting is common, but it isn’t universal, and the growing body of evidence on short implants means fewer people need it than needed it ten years ago.
Can I get implants if I only have a few teeth left?
Yes, and this is worth a real conversation rather than a default. Before pulling anything, we run what we call the Foundation Test on each remaining tooth: is there enough tooth left to rebuild, can the bone still hold it, does it do a job worth keeping, and does the math work over ten years rather than ten weeks? A tooth that fails all four is better out. A tooth that anchors a partial denture may be worth keeping for years, even if it isn’t beautiful.
Your Path to a Natural Smile Starts Here
If you’ve been carrying around a “no” from someone else, bring it in. Bring the X-rays too. Most of the no’s we see turn out to be a not-yet with a three-month plan attached, or a not-like-that with a straightforward alternative, and the only way to know which one you’re holding is to look at the actual bone.
Your first visit is free, second opinions are free, and adjustments stay free for the life of your teeth. Come see us in Eugene, Salem, Corvallis or Roseburg, or call 866-551-3509.
Give us 30 minutes, and we’ll have you smiling again.
