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Dental insights
Why Some Dental Implants Struggle Later: Gums, Stress and Your Jaw
How gum health, jaw clenching and a new HRV hypothesis relate to long-term implant care, and what remains untested.
Dental implants can function for many years, but research estimates that peri-implantitis affects around one in five implant patients. This involves inflammation and loss of supporting bone around an implant. A new paper by Westcoast Smile’s Dr. David Cheng explores whether the body’s regulation of inflammation, together with clenching and grinding, may help explain differences between patients. It presents a hypothesis that still needs testing.
Research context: Dr. David Cheng’s hypothesis and theory article, published in Frontiers in Dental Medicine on 20 October 2026.
What is peri-implantitis?
A dental implant is a small post placed in the jaw that supports a crown, bridge or other replacement tooth. After it becomes stable in the bone, it can support chewing for many years. Peri-implantitis involves inflammation around the implant together with progressive loss of supporting bone.
It is not rare. A large 2025 review of 102 studies and more than 13,000 patients puts it at roughly 21% of implant patients, with about 22% affected over twenty years. Most implants do well. But a meaningful minority run into this problem, and dentists still cannot reliably predict who will.
It also helps to know what peri-implantitis is not. A little bone settling around a new implant in the first months is usually normal. The body is building a seal of gum and tissue around the implant, and some bone remodels to make room for it. Your dentist tracks this on x-rays so that normal healing is not confused with the start of a problem.
What already raises the risk
Several factors are linked with higher odds of peri-implantitis, mostly in the range of two to four times. These are risk indicators, not guarantees: plenty of people with them never develop the problem.
| Factor | What studies found | What you can do |
|---|---|---|
| History of gum disease | About 3 times the odds; about 4 times if the disease is active | Treat gum disease first and keep up periodontal care |
| Little firm, attached gum around the implant | About 2.8 times the odds | Ask for the gum to be checked at planning and at reviews |
| Skipping professional maintenance | About 2.4 times the incidence in a 5-year study | Keep your hygiene and implant review visits |
| Diabetes | About 2.3 times the odds | Keep blood sugar well controlled with your doctor |
| Smoking | A modest risk indicator; about double the odds of implant failure in one analysis | Cut down or quit, and ask us for support |
| Depression or antidepressant use | Listed as a risk indicator in the 2025 expert consensus | Share your medical history and current medications with your dentist |
These associations do not predict an individual patient’s outcome. Daily plaque control, smoking cessation support and professional maintenance remain important parts of implant care. The new paper asks whether additional host-response factors may help explain differences that the usual risk indicators do not fully capture.
The puzzle: same mouth, different results
Dentists see patterns that a simple checklist of risks does not explain:
- One implant struggles while its neighbours thrive. Several implants placed on the same day, by the same dentist, in the same mouth, and only one or two develop disease.
- Mirror-image problems. Sometimes the implants on the left and right sides lose bone in almost the same way and to the same degree.
- Risk factors that only tilt the odds. Most smokers’ implants never develop peri-implantitis.
- Disease with no risk factors. Some patients with healthy gums who do not smoke still develop it.
In his paper, Dr. Cheng argues that these patterns point to something missing from the picture. Each implant faces its own local challenge, such as plaque, bite forces or tiny titanium particles. But your body as a whole also has a limited ability to keep inflammation in check. In his model, disease appears at the spot where the local challenge outweighs what your body can contain.
Think of it like a fire brigade. Sparks start at particular spots in the mouth. Whether a spark becomes a fire depends partly on the spark, and partly on how quickly and effectively your body’s brigade responds.
The new idea: your body’s calming capacity
One way to picture the autonomic nervous system is as an accelerator and a brake. The sympathetic response is often associated with activation, while parasympathetic pathways, including the vagus nerve, are involved in regulation and recovery. Research in other fields has explored how these pathways interact with inflammation. Applying that work to peri-implantitis is part of Dr. Cheng’s proposed explanation.
Heart rate variability (HRV) describes variation in the time between heartbeats. Certain HRV measurements can provide information related to autonomic regulation, but readings depend on the method and measurement conditions. HRV can be recorded non-invasively; it is not a direct measurement of inflammation around a dental implant.
Dr. Cheng’s paper proposes that a low HRV may mean a lower threshold for peri-implantitis, so that ordinary plaque and bite forces are more likely to tip into disease. Depression, which is already on the list of risk indicators, is linked with lower HRV, so the two ideas fit together.
What this does not mean. The paper’s literature search identified no direct prospective study testing HRV as a determinant of peri-implantitis. It draws partly on evidence from adjacent fields and sets out studies that could test or challenge the hypothesis. It does not establish that an HRV reading predicts implant failure or determines whether someone should receive an implant.
Where jaw clenching and TMJ problems fit in
Clenching and grinding can place repeated mechanical loads on implants. Dr. Cheng proposes that autonomic regulation could be relevant both to inflammatory response and to the activation associated with sleep bruxism. That proposed connection needs testing; it does not mean that every person who grinds has TMD or will develop peri-implantitis.
Three facts make the jaw matter for implants:
- Implants have no shock absorber. A natural tooth hangs in a ligament that cushions and spreads out chewing forces. An implant bonds directly to bone, so more of the force goes straight to the implant and the bone around it.
- Grinding is tied to stress activation. In sleep studies, bursts of night-time grinding tend to be preceded by a rise in the body’s stress response, such as a faster heartbeat and deeper breathing. Grinding is then repetitive, sustained loading, quite unlike normal chewing.
- The numbers are significant. Meta-analyses report that people who clench or grind have about 7 times the odds of a fractured implant screw and more than 16 times the odds of a fractured implant, and about 4.7 times the odds of implant failure. Those are mostly mechanical problems, which are different from peri-implantitis, but they show how hard these forces can be on implants.
Dr. Cheng’s paper suggests that low calming capacity could act on both sides at once: it may lower your threshold for inflammation, and it may raise the bite load through clenching and grinding. This fits earlier research finding that bite overload and plaque bacteria seem to work together rather than separately.
Signs your jaw may need attention
A temporomandibular disorder (TMD) is a group of conditions affecting the jaw joint and chewing muscles. Common signs include:
- jaw, face or neck pain
- clicking, popping or grating when you open or close
- the jaw locking or feeling limited
- headaches that can mimic migraines, or earaches linked with jaw pain
- waking tired or with a sore jaw
If you have jaw pain, locking or restricted opening, discuss a TMJ/TMD assessment before or after implant treatment. Clicking without pain is common and does not necessarily need treatment. Our bite correction and malocclusion guide explains the separate assessment of how teeth fit together; a bite change should not be assumed to resolve TMD.
What you can do now
The basics still come first, and one new habit is worth adding: tell your dentist how you use your jaw.
- Mention clenching, grinding and jaw symptoms. Tell us about morning jaw soreness, headaches, clicking or a partner who hears you grind, before implant treatment and at any later visit.
- Ask about protecting your bite. If you grind, ask whether a custom-fitted oral appliance suits you. Not every grinder needs one, and the right choice depends on your assessment.
- Keep gum disease under control. Treat it before implants, and keep up your hygiene visits afterwards.
- Clean around the implant every day. Effective brushing and interdental cleaning are part of long-term maintenance, and professional reviews of your bite and gums catch small changes early.
- Manage smoking and diabetes. Both are linked with higher implant risk, and both are worth discussing with your dentist and doctor.
- Act early on changes. Bleeding when you clean around an implant, swelling, tenderness or a bad taste near it deserve a prompt visit rather than a wait-and-see.
- Consider your stress regulation. HRV biofeedback is a way of training slow, steady breathing against a live reading of your heart rhythm. Its use for TMD and bruxism has been described in a published case report. Whether it changes implant outcomes is untested, so treat it as a complement to the points above, not a replacement.
If you are considering an implant
None of this is a reason to avoid implants. They succeed reliably for most people, and for many they are a stable, natural-feeling way to replace a missing tooth. The point is that a good plan looks beyond the empty space.
At a dental implant consultation at Westcoast Smile, we review the missing-tooth area, your gum health, your bite and your records, and decide whether more imaging is needed. We also discuss alternatives such as a bridge or a denture, so the choice fits your situation rather than assuming an implant is always the answer. If an implant is appropriate, you get a written plan that explains the sequence of treatment before you commit.
If you clench, grind or have jaw symptoms, raise them at that first visit. A TMJ/TMD consultation considers your symptoms, jaw function and relevant dental findings. Any additional records or tests should answer a specific clinical question; an HRV reading is not an established test for predicting implant failure.
To book, call (604) 737-1023 or request an appointment. We are at 1–1874 West 1st Avenue, Vancouver, in Kitsilano.
Common questions
Does clenching or grinding mean I cannot have an implant?
No. It means your plan should account for it, so tell your dentist before treatment starts.
Is the new research proven?
No. Dr. Cheng’s paper is a hypothesis article. It connects existing evidence and sets out predictions that still need to be tested in studies of implant patients.
Can an HRV test tell me if my implant will fail?
No validated HRV-based test for predicting peri-implantitis or implant failure is established by this paper. Its proposed relationship still needs direct clinical testing.
How often should I have implant check-ups?
Your dentist sets the schedule based on your gums, bite and risk factors. Regular professional maintenance is linked with lower rates of peri-implantitis, so ask what is right for you.
Where do I start?
Book a consultation to talk through your goals and options. You can also read our implant guide for Vancouver patients and our article on preventing dental implant complications.
Sources and disclosure
Read the original Frontiers publication, download the full paper PDF, or explore the clinic’s media and publications.
This article summarizes research by our own clinician. Dr. David Cheng works at Westcoast Smile Dental Studio, and the paper below is a hypothesis article, not a clinical trial. It is general information, not personal medical advice.
- Cheng D. Peri-implantitis and heart rate variability: a missing modifiable risk determinant. Frontiers in Dental Medicine, 20 October 2026.
- Galarraga-Vinueza ME et al. Prevalence, incidence, systemic, behavioral, and patient-related risk factors and indicators for peri-implant diseases. J Periodontol, 2025 (prevalence, incidence and risk indicators, as cited in the Frontiers paper).
- Costa FO et al. Peri-implant disease in subjects with and without preventive maintenance: a 5-year follow-up. J Clin Periodontol, 2012 (maintenance, as cited in the Frontiers paper).
- Mahardawi B et al. The lack of keratinized mucosa as a risk factor for peri-implantitis. Sci Rep, 2023 (firm gum tissue, as cited in the Frontiers paper).
- Moraschini V, Barboza ESP. Success of dental implants in smokers and non-smokers. Int J Oral Maxillofac Surg, 2016 (smoking, as cited in the Frontiers paper).
- Bruxism associations: Vidal et al., mechanical implant complications and Ionfrida et al., implant failure, both 2025 meta-analyses cited in the Frontiers paper.
- Westcoast Smile pages: Dental Implants and TMJ/TMD Treatment.
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