Tooth grinding — what eight hours a night actually does.

About 8-12% of adults grind their teeth at night. Many more do it during stressful periods or during the daytime without noticing. Few are diagnosed. The damage compounds.

What grinding is ¶

Bruxism — the clenching, grinding, or rhythmic gnashing of teeth during sleep or while awake. Forces during sleep bruxism can exceed normal chewing pressure by 10×. Over thousands of nights, the wear accumulates.

How to know if you do it ¶

You probably won't notice during sleep. The signs adults miss:

• Worn flat edges on canines and incisors (rounder, blunter than they used to be)
• Cupped or polished molar surfaces — bite surfaces are flatter than the natural ridges
• Jaw soreness in the morning that fades over breakfast
• Headaches concentrated at the temples on waking
• Tooth sensitivity to cold that wasn't there 2 years ago
• Partner reports of teeth-grinding sounds at night
• Receding gums with vertical notches at the gumline (abfraction)
• Cracked or chipped teeth — small lines on the front faces

If three of these match, you almost certainly grind.

The slow consequences ¶

Year 1-3 ¶

Minor wear, occasional jaw soreness. Most adults don't notice.

Year 3-7 ¶

Visible flattening of canines/incisors. Mild gum recession. Increased cold sensitivity. Headaches gain frequency.

Year 7-15 ¶

Enamel loss reveals dentin. Teeth read yellower (more dentin showing). Filling and restoration wear accelerates. TMJ pain may emerge. Some cracked teeth.

Year 15+ ¶

Vertical dimension loss (teeth shorter, lower face slightly collapsed). Major restoration work often needed. Chronic jaw pain in 30-40% of long-term cases.

Why grinding happens ¶

The honest answer: not perfectly understood. Strong correlations with:

• Stress and anxiety — most studied driver
• Sleep apnoea — body grinds to reopen airway
• Caffeine and alcohol consumption
• Certain medications (SSRIs especially)
• Bite misalignment — historically blamed; less central than once thought

What helps ¶

Night guard ¶

Custom-fitted dental guard. ₹3,000-8,000 in India. Protects enamel from continued wear. Reduces TMJ stress. Single most important intervention.

Address upstream causes ¶

Stress management. Caffeine reduction (no coffee after 2 PM). Alcohol moderation. Sleep hygiene improvements. Mediation/therapy if anxiety is core.

Treat sleep apnoea ¶

If suspected. CPAP often reduces nightly grinding dramatically.

Botulinum injection (advanced cases) ¶

For severe bruxism, Botox injections into the masseter muscle reduce force significantly. Not a first-line treatment.

What doesn't help ¶

• "Just stop grinding" — it's involuntary, mostly during sleep
• Bite splints from the pharmacy — wrong fit, can make it worse
• Soft DIY mouth guards (boil-and-bite from sports stores) — wrong material, wear through fast

Whitening with bruxism ¶

You can still whiten. But know:

• Enamel is already thinner than average — sensitivity is more likely
• The micro-cracks from grinding can let peroxide reach the nerve faster
• A night guard during the whitening course actually helps (less continued damage during the high-permeability phase)

Eight hours of clenching does more than a year of brushing.

What you don't notice does the most damage.

Disclaimer. Editorial, not medical advice. Bruxism diagnosis and treatment require a registered dental professional.