A 2016 meta-analysis reported that dental prostheses in people who grind their teeth had about 4.7 times the odds of failure, and patients about 3.8 times, compared with non-grinders (Zhou et al., Clinical Implant Dentistry and Related Research, 2016). Two years earlier, a systematic review of 21 papers had concluded that bruxism is unlikely to be a risk factor for biological implant complications (Manfredini et al., Clinical Implant Dentistry and Related Research, 2014). Both are in the literature, and both are cited.

If you grind, that contradiction matters, because grinding is often blamed for fractured crowns, chipped veneers, and loose implant parts. This guide covers how common grinding is, what the studies say about implants, crowns, and veneers, why they can’t settle the question, and what the evidence does and doesn’t say about night guards.

Key Takeaways Frequent sleep bruxism affected about 12.8% of adults in pooled data, but most prevalence figures rely on self-report. One meta-analysis linked grinding to roughly 4-fold higher odds of implant prosthesis failure, while a 21-paper review found bruxism unlikely to cause biological implant complications and possibly a mechanical risk. A Cochrane review found insufficient evidence that occlusal splints treat sleep bruxism itself.

How Common Is Teeth Grinding?

Common, but harder to measure than most people assume. A 2013 systematic review of 35 publications could extract prevalence from only seven. Frequent sleep bruxism was reported at 12.8% (±3.1) across three studies, awake bruxism at 22.1% to 31% across two, and generically identified bruxism at 8% to 31.4% across two (Manfredini et al., Journal of Orofacial Pain, 2013). Bruxism was unrelated to sex and became less common in elderly people.

The authors urged caution, because most data came from self-reports and diagnostic bias is likely. That caveat runs through everything below: when studies say “bruxers,” they often mean “people who say they grind,” not people measured grinding in a sleep lab.

Reported Prevalence of Bruxism in Adults Range chart on a 0 to 40 percent axis. Generically identified bruxism: 8 to 31.4 percent (2 studies). Awake bruxism: 22.1 to 31 percent (2 studies). Frequent sleep bruxism: 12.8 percent with a standard deviation of 3.1 across 3 studies, shown as a point. Prevalence data came from 7 of 35 publications and relied heavily on self-report. Source: Manfredini et al., Journal of Orofacial Pain, 2013. 0% 10% 20% 30% 40% Generic bruxism (2 studies) 8-31.4% Awake bruxism (2 studies) 22.1-31% Frequent sleep bruxism (3) 12.8% (SD 3.1)
Prevalence ranges from about 1 in 8 to nearly 1 in 3 depending on the definition, which is why single headline figures deserve caution.

Does Grinding Raise the Risk of Implant Problems?

The studies disagree. The 2016 meta-analysis pooled odds ratios of 4.72 (95% CI 2.66 to 8.36) for prostheses and 3.83 (95% CI 2.12 to 6.94) for patients, concluding that bruxism contributes to technical and biological implant complications and to failure (Zhou et al., Clinical Implant Dentistry and Related Research, 2016). The abstract also lists p-values of .07 and .22 beside those results, and I couldn’t confirm what they test, so don’t over-read the precision.

The 2014 review took a different route. Of 21 papers, 14 assessed biological complications such as implant failure and bone loss. Bruxism was not related to implant failure in 6, and the other 8 allowed no conclusion. For mechanical complications such as component and prosthesis failures, 4 of 7 studies showed a positive relationship. The authors concluded bruxism is unlikely to be a risk factor for biological complications, and may be one for mechanical complications (Manfredini et al., Clinical Implant Dentistry and Related Research, 2014).

Bruxism and Implant Prosthesis Failure: Pooled Odds Ratios Forest plot on a logarithmic axis from 1 to 10. Prostheses in bruxers versus non-bruxers: odds ratio 4.72, 95 percent confidence interval 2.66 to 8.36. Patients: odds ratio 3.83, interval 2.12 to 6.94. The abstract reports p-values of .07 and .22 beside these results. A separate 21-paper review found bruxism unrelated to implant failure in 6 papers on biological complications and positively related to mechanical complications in 4 of 7. Source: Zhou et al., 2016; Manfredini et al., 2014. No difference (1) 1 2 5 10 Prostheses OR 4.72 (2.66 to 8.36) Patients OR 3.83 (2.12 to 6.94) Logarithmic axis. Higher on the right means more failures in bruxers.
Both intervals sit well above 1, yet a separate review of 21 papers found no link to biological complications, so the two bodies of evidence don’t line up.

[UNIQUE INSIGHT] Both findings can be true. The meta-analysis pooled failures, including technical ones, across studies with varied definitions of bruxism, while the review separated biological outcomes (bone and implant loss) from mechanical ones (screws, components, prostheses). Grinding may chip and loosen parts without causing the bone around an implant to fail, which matches the review’s split result. Neither can prove cause, because bruxism is usually self-reported.

What About Crowns and Veneers?

The evidence is thinner and mostly indirect. In a 2022 meta-analysis of solid zirconia crowns on natural teeth, one study of patients with bruxism reported a survival rate of only 31.6%, against 91% to 100% elsewhere, inside a pooled analysis with very high heterogeneity (Leitao et al., Journal of Prosthodontic Research, 2022). That’s a single study, and a flag, not a rule.

For veneers and other restorations, the site’s guide to habits that damage dental work covers a clinical study linking parafunctional habits to fractured composite restorations. For crowns, see how survival numbers read in how long dental crowns last and the material-specific points in the zirconia crown guide.

Pink-gloved hands holding a transparent dental jaw model above a dish of small dental parts

Do Night Guards Stop Grinding?

The evidence says they protect teeth better than they stop the grinding. A Cochrane review of occlusal splints for sleep bruxism found 5 randomized trials, a pooled arousal-index result with no significant difference from controls, and not enough evidence that splints are effective for sleep bruxism, though there may be some benefit for tooth wear (Macedo et al., Cochrane Database of Systematic Reviews, 2007). A 2021 review of 14 trials rated all of them at medium to high risk of bias and found insufficient evidence to favor splints over no treatment or other approaches (Hardy and Bonsor, Journal of Dentistry, 2021).

Splints do have support for a related condition. A 2020 network meta-analysis of 48 trials found occlusal splint therapy reduced pain in temporomandibular disorders, with evidence quality from moderate to very low (Al-Moraissi et al., International Journal of Oral and Maxillofacial Surgery, 2020). Jaw pain from a splint trial isn’t the same outcome as protecting a crown from grinding.

What the Splint Evidence Covers Three-card evidence summary. Card one: Cochrane 2007, 5 randomized trials, no significant difference in the pooled arousal index, insufficient evidence for sleep bruxism, possible benefit for tooth wear. Card two: Hardy and Bonsor 2021, 14 trials, all medium to high risk of bias, insufficient evidence to favor splints. Card three: Al-Moraissi 2020, network meta-analysis of 48 trials, splints reduce pain in temporomandibular disorders, quality moderate to very low. Cochrane 2007 5 trials, sleep bruxism No clear effect on sleep outcomes Possible tooth-wear benefit Review, 2021 14 trials, bruxism All medium or high risk of bias Insufficient evidence Network MA, 2020 48 trials, jaw disorders Splints reduce pain (TMD, not grinding) Quality moderate to very low
The strongest splint evidence is for jaw-joint pain, not for stopping grinding or protecting restorations.

[CITATION CAPSULE] A 2007 Cochrane review of 5 randomized trials found no significant difference between occlusal splints and controls on the one pooled sleep outcome, and a 2021 review of 14 trials rated all of them at medium to high risk of bias, so neither found enough evidence that splints treat sleep bruxism itself (Macedo et al., Cochrane Database of Systematic Reviews, 2007; Hardy and Bonsor, Journal of Dentistry, 2021).

None of that means a night guard is pointless. A guard can still take the wear instead of your enamel or your crown, which is what the Cochrane authors noted as a possible benefit. It means the evidence for a guard preventing damage is weaker than its reputation. The habits guide covers custom versus boil-and-bite fit.

[PERSONAL EXPERIENCE] Most patients first learn they grind from a partner or from worn, flat tooth surfaces, not from pain. The conversation worth having is whether the guard is for comfort, for tooth wear, or for protecting expensive work, because the evidence supports those goals unequally.

What Should You Ask Your Dentist?

Five questions fit nearly every case:

  • Do I show signs of wear or fractures that suggest I grind?
  • Is my bite likely to overload the crown, veneer, or implant I’m considering?
  • Would a custom guard help, and what is it expected to protect?
  • Does the material you’re recommending have data in people who grind?
  • What happens to my warranty or repair cost if the restoration chips?

Isn’t it more useful to plan around grinding than to deny it? The implant risk factors guide covers other factors that sit alongside it.

[ORIGINAL DATA] We’re evaluating recording, in general terms, how often patients in this practice are advised to wear a guard around crowns, veneers, or implants, without publishing a figure until it’s properly documented across a larger patient base.

Frequently Asked Questions

Does teeth grinding damage crowns, veneers, and implants?

It may. A 2016 meta-analysis found about 4-fold higher odds of implant prosthesis failure in bruxers, while a 21-paper review found bruxism unlikely to cause biological implant complications and possibly a mechanical risk. Neither study can prove cause.

How common is teeth grinding?

Frequent sleep bruxism affected about 12.8% of adults in pooled data, awake bruxism 22.1% to 31% in two studies. Most figures rely on self-report, so they’re best read as rough estimates.

Can I get dental implants if I grind my teeth?

Bruxism isn’t automatically a barrier. A 21-paper review concluded it’s unlikely to be a risk factor for biological implant complications, though it may raise the risk of mechanical ones. Have your bite assessed before planning.

Do night guards really work?

Not clearly for stopping grinding. A 2007 Cochrane review of 5 trials found insufficient evidence for sleep bruxism, with possible benefit for tooth wear, and a 2021 review of 14 trials reached the same conclusion on evidence quality.

How do I know if I grind my teeth?

Worn, flat, or chipped teeth, a partner hearing grinding, and morning jaw tension are common clues. Self-report is unreliable, which is why a dental examination matters more than a quiz.

Conclusion

Grinding is common, the studies linking it to dental-work failure conflict, and the evidence for night guards is weaker than their reputation. The most defensible reading is that grinding may raise mechanical risk for crowns, veneers, and implant parts, and may not affect the bone around an implant.

The practical step is to have your bite assessed before major work and to ask what each option is expected to protect. For the habits that most often damage restorations, see What Actually Damages Dental Work: Habits That Shorten Implant and Veneer Lifespan.

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