Editor’s note (Updated September 8, 2025): We refreshed this article with clearer explanations of attrition vs. erosion vs. abrasion, added up-to-date clinical references, and included a practical action plan (night guard options, acid management, habit tips). We also linked it into our Pain Relief pillar and related how-to guides for easier next steps. This content is educational and not a diagnosis—please see your dentist for personalized care.
Why are my teeth getting shorter?
Short answer: Flat, shorter-looking teeth are most often caused by tooth wear — especially bruxism (teeth grinding/clenching), but also acid erosion and abrasion from habits or brushing. A custom night guard (and a thin day guard if you clench during the day) helps stop further damage while you address root causes.
This article is part of our pillar: Jaw & Teeth Grinding Pain: Complete Guide to Relief & Prevention.
What “flat teeth” really means
When the chewing edges look filed down or your smile shows less tooth than it used to, it’s usually one (or a combo) of:
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Attrition (tooth-to-tooth wear): Classic with bruxism — teeth are rubbed under force, flattening cusps and thinning enamel. Signs often include flattened or chipped teeth and worn enamel. Kuh University
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Erosion (chemical wear): Acid (from diet or reflux) softens enamel, so it thins and edges shorten over time. ADA
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Abrasion (mechanical wear): Over-zealous scrubbing with a hard brush, or habits like nail/pen chewing.
Reality check: many adults do a bit of all three. That’s why the plan is “protect + address causes,” not one silver bullet.
Is it bruxism?
Common clues: morning jaw tightness, headaches, tooth sensitivity, and flattened chewing surfaces. Bruxism happens awake or asleep and is common; prevalence estimates vary by study and definition (roughly ~8–31%). NIDCR
Self-check (quick):
Do back teeth look squared off or edges feel “evened out”?
Do you wake with jaw soreness or temple headaches?
Any partner notice grinding sounds?
If “yes,” you’re a strong candidate for protection and habit tweaks.
Signs you’re grinding at night → “How do I know if I’m grinding my teeth at night?” →
Morning headaches from grinding → “Why do I wake up with headaches from teeth grinding?” →
When flat teeth affect more than looks
Uneven wear can change your bite, stress the TMJ, and increase sensitivity or cracking risk. Severe wear may need bonding, veneers, or crowns to rebuild height — but start by preventing new damage first.
For TMJ: national guidelines caution against irreversible “bite change” procedures as first-line care for jaw pain. Start conservative.
Stop the wear: your action plan
1) Put a barrier between teeth
- Custom Night Guard (sleep bruxism): creates space, reduces load, and stops attrition.
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Thin Day Guard (awake clenchers): nearly invisible, great for desk-time clenchers.
These devices don’t cure grinding, but they prevent damage while you work on triggers.
2) Tackle acid if erosion’s in the mix
- Audit acidic drinks (sodas, citrus waters, sports drinks).
- If you have reflux/GERD, see your clinician; managing it helps protect enamel.
- Rinse with water after acids; wait ~30 minutes before brushing to avoid scrubbing softened enamel.
3) Calm the clench
- Set “jaw drop” reminders (lips together, teeth apart, tongue relaxed).
- Sleep hygiene, stress management, and physical therapy/jaw relaxation can help reduce episodes.
4) Restore, if needed
- Bonding/veneers/crowns can rebuild length and function when wear is advanced — planned by your dentist once protection is in place.
When to see a dentist (soon)
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Rapid change in tooth shape/length
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Cracks, chips, or sensitivity that’s worsening
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Jaw locking, popping, or bite suddenly feels “off”
Early intervention prevents bigger, pricier fixes.
Sentinel picks (so you can protect tonight)
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Hard Night Guard (durable, slim): ideal for moderate-to-heavy grinders.
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Dual-Laminate Night Guard (hard outside, cushioned inside): comfort + strength.
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No-Show Day Guard (extra thin): for daytime clenchers who need stealth protection.
Questions before you buy? Check our Night guard & teeth-grinding FAQs.
Keep learning: This article is part of our Complete guide to jaw & teeth-grinding pain to help you relieve symptoms and prevent further wear.