Why Dental Implants Fail — and How We Lower the Odds
Why do dental implants fail? The early and late causes, the warning signs worth a phone call, and the eight things we do to lower the odds.
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Medically reviewed by Dr. Ali Fatemi, DDS, FAGD, MAGD, FICOI, MaCSD — Fatemi Family Dentistry, Gaithersburg & Lexington Park, MD.
The short version: diabetes and gum disease are usually manageable — smoking is not. We do not place dental implants in patients who smoke. For the other two, the implant is a reasonable bet once the condition is brought under control, and that has to happen before the surgery, not after. Here is how we handle each one.
An implant succeeds when bone grows onto it in the first months and when the gum around it stays healthy for years. Diabetes slows bone and wound healing and weakens the response to infection. Smoking starves the healing site of oxygen and blood flow and roughly doubles the long-term failure rate in most published series. Gum disease is, quite simply, the same infection that later attacks implants, and an implant placed next to it inherits it. Three different mechanisms, one shared outcome — which is why they are the three questions every implant consultation begins with. (For the full picture of what goes wrong and why, see why dental implants fail.)
What we check: whether you have type 1 or type 2, what you take for it, and — most importantly — your recent HbA1c, the three-month average of your blood sugar. If you don’t know it, your physician does, and we will ask for it.
How we decide: we do not work from a single cut-off number. If your HbA1c is above normal, we contact your physician and ask them to assess how stable the diabetes is. If your physician clears you and certifies that the diabetes is under control, we go ahead with implant therapy. That judgement belongs to the doctor who manages your diabetes, not to us — and it is a better judgement than any fixed threshold, because it takes in your whole history rather than one lab value. Well-controlled diabetic patients have implant success rates close to non-diabetics; placing an implant into uncontrolled diabetes means slower healing and higher infection risk, and the patient is the one who pays for that.
What changes on the day: appointment timing around your medication and meals, particular attention to fasting instructions if you are sedated, sometimes an antibiotic around surgery, and closer follow-up in the first weeks. IV sedation itself is routinely used for diabetic patients; we coordinate the fasting window with your medication schedule so blood sugar does not drop.
Our policy is a straight answer: we do not perform implant surgery on patients who smoke. Not “we will, with a warning.” We do not.
Why we will not simply ask you to pause. It is a common suggestion — stop for a couple of weeks before surgery and a few weeks after — and it is not enough. Stopping around the surgery helps the implant heal in the first months, but smoking keeps contributing to failure after the implant is placed and integrated. Smoking starves the gum and bone of oxygen and blood flow, year after year; smokers lose bone around implants faster and develop peri-implantitis more often. A pause protects the first three months and leaves the next twenty years exposed. We would rather tell you that now than place an implant that fails later.
Vaping is not a way around it. Nicotine constricts blood vessels however it is delivered, and the heat and chemicals irritate the healing gum. We treat vaping as smoking.
What this means in practice. If you smoke and you want implants, quitting is the first step of the treatment plan, not a footnote to it. Many patients have used exactly this as the reason to stop, and we are glad to plan the treatment around the date you quit. If you are not going to stop, we will say so plainly and discuss the alternatives — a bridge or a denture is an honest option, and a better one than an implant we expect to lose.
What we check: a full periodontal charting — pocket depths, bleeding, bone levels on X-rays — around every remaining tooth, not just the gap where the implant is going.
The rule: active gum disease is treated first, always. An implant placed in a mouth with untreated periodontitis is placed among bacteria that will colonise it. Treatment starts with initial therapy — deep cleaning (scaling and root planing), sometimes with antibiotics.
Then we re-evaluate. After that initial therapy we reassess your periodontal status. If it is within normal limits, we continue with the implant treatment. If the periodontal disease is unstable, we refer you to a periodontist — a gum specialist — before going any further. That referral is not us passing you along; gum disease that does not respond to initial therapy needs a level of care that belongs with a specialist, and the implant will only last if the gums around it are healthy first.
The history matters even after treatment. A patient who has had periodontitis remains at higher risk of peri-implantitis for life, even with healthy gums today. That means a tighter maintenance schedule — typically every three to four months rather than six — and it means we say so before the implant, not after. Patients on our periodontal membership plan have that maintenance built in.
Bone loss from gum disease is also the most common reason a bone graft is needed before the implant: the disease took the bone, and it has to be rebuilt.
Not the topic of this article, but on the same list at every consultation: bisphosphonate or other bone medications (osteoporosis, cancer treatment), radiation to the head and neck, uncontrolled autoimmune disease, immunosuppressants, heavy alcohol use, and untreated grinding. Each is a conversation, not a verdict.
When we ask a patient to get their physician’s clearance, or to complete gum treatment first, it is not a rejection. It is the difference between an implant that lasts and one that is removed in a year — and it is usually a matter of weeks, not years. In the meantime the plan is written, the scan is done, and the price is known. The day you are cleared, the surgery is booked. Smoking is the one case where the answer is not “wait” but “stop” — and there, the date you quit is the date the plan starts.
Yes. If your HbA1c is above normal we ask your physician to assess how stable the diabetes is; once they clear you and confirm it is under control, we proceed. Well-controlled diabetic patients have success rates close to non-diabetics.
Not at our practice. We do not place implants in patients who smoke, and quitting for a few weeks around the surgery does not change that — smoking keeps working against the implant long after it has healed. If you quit, we will plan the treatment with you.
After initial therapy and a re-evaluation showing your periodontal status is within normal limits, yes. If it is still unstable, we refer you to a periodontist first. Never during active disease.
No — sedation makes the surgery easier for the patient and the surgeon, and it is used routinely for patients in all three groups, but it does not change the healing biology. The preparation still has to be done.
Bring your medication list and, if you are diabetic, your last HbA1c and your physician’s contact details to a consultation. Dr. Fatemi will tell you plainly which of “now,” “after your physician clears you,” “after gum treatment,” or “after you quit” applies — and for everything except smoking, the plan is the same either way; only the start date moves.
See how dental implants are planned and placed at our Maryland offices →
Not sure where you stand? Ask our team — it’s the most common question we get.
General information, not a diagnosis. The policies described are those of Fatemi Family Dentistry, LLC and are applied individually; your suitability depends on your full medical history, reviewed with your physician where appropriate. Please confirm all clinical content against your practice’s regulatory and compliance requirements before publication.
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