Flat, short, sensitive, or chipped teeth are one of the most common things people notice as they get older — and one of the most misunderstood. “I must grind” is the usual assumption, but grinding is only one of several causes, and the treatment depends entirely on which one you have.
- There are four kinds of tooth wear, and telling them apart is the whole diagnosis.
- Grinding (attrition), acid (erosion), mechanical (abrasion), and flexure (abfraction) each look and behave differently.
- Common drivers include bruxism, acid reflux, diet — and, often missed, the airway.
- Wear speeds up once enamel is gone, because the dentin underneath wears about twice as fast.
- The fix ranges from a night guard and changing the cause, to rebuilding — but only after the cause is identified.
The four kinds of wear
Attrition is tooth-on-tooth wear, the classic grinding pattern — flat, matching worn spots on teeth that meet. Erosion is acid dissolving the enamel — from reflux, frequent acidic drinks, or certain diets; it looks smooth, shiny, and often cupped-out. Abrasion is mechanical, like aggressive brushing, notching teeth at the gumline. Abfraction is thought to come from the tooth flexing under bite stress, chipping enamel away near the gum. Most worn mouths are a mix, and the pattern tells the story.
What's actually driving it
Grinding and clenching (bruxism) is the most familiar cause, and it's frequently tied to stress — and, notably, to the airway: many people clench in their sleep in response to disrupted breathing. Acid is the other big one, whether from reflux (sometimes silent) or a diet heavy in soda, citrus, or sports drinks. Brushing habits and bite forces round out the picture. Because the causes are so different, guessing wrong means treating the wrong problem.
Why it accelerates
Enamel is the hard, protective outer shell. Once it wears through, the softer dentin underneath is exposed — and dentin wears roughly twice as fast as enamel. That's why wear often seems slow for years and then speeds up: you've reached the softer layer, and the process compounds. It's also why teeth become sensitive as they wear, since dentin carries sensation.
Watch it, or act on it?
Not all wear needs restoring today, but all of it needs a cause identified and monitored. The honest approach is to measure it — photos and models over time — so you can see whether it's stable or progressing, rather than reacting to a guess. Stable, mild wear with the cause controlled may simply be watched. Progressing wear, sensitivity, or teeth losing noticeable height is a signal to act before there's little tooth left to build on.
Protect versus rebuild
The first job is always to remove or manage the cause: a night guard for grinding, addressing reflux with your physician, changing acidic habits, softening brushing. Protecting what's left is cheaper and more conservative than rebuilding. When wear has already cost significant tooth structure — flat, short, sensitive teeth — restoring height and function may be needed, but it's done after the cause is under control, or the new work simply wears too.
When to see a dentist
Come in if your teeth look shorter or flatter, feel newly sensitive, have cupped or notched areas, or if you wake with jaw soreness or a partner hears you grind. Mention reflux or heavy consumption of acidic drinks — those change the diagnosis. Catching wear early keeps the fix simple.
Summary
Tooth wear isn't one thing — it's grinding, acid, mechanical wear, or flexure, and often a mix. The pattern reveals the cause, and the cause dictates the fix. Wear speeds up once enamel is lost, so identifying it early matters. Manage the cause first — a night guard, reflux control, gentler habits — and rebuild only when needed, once the environment is calm. The wrong assumption leads to the wrong treatment; the right diagnosis makes the fix last.