Why stomach acid is in a different category
The acids in food and drink are mild by comparison with what the stomach produces. Gastric contents are strongly acidic — far below the level at which enamel begins to dissolve — so exposure that’s repeated over months or years can cause substantial and rapid loss of tooth structure.
This is not a marginal concern. Where stomach acid reaches the mouth regularly, it is often the single most damaging thing happening to the teeth, and no amount of careful brushing addresses it, because the cause is not on the tooth surface.
It also tends to be invisible to the person it is happening to. Wear of this kind accumulates slowly, both sides of the mouth change together so there’s nothing to compare against, and the teeth rarely hurt until a good deal of structure has gone. That combination is why it is so often found at a routine examination rather than reported by a patient.
The pattern a dentist notices
Erosion from stomach acid tends to affect the inner surfaces of the upper front teeth and the biting surfaces of the back teeth, because of how refluxed material moves and pools in the mouth. The surfaces become smooth and thinned, the edges of the front teeth grow translucent and may chip, and cupped hollows appear on molars.
Existing fillings can end up standing above the surrounding surface, since restorative materials do not dissolve while tooth structure around them does. That sign is a useful indicator of active erosion rather than old damage.
I want to be careful here for the same reason I am careful everywhere on this site. This is a description of a general pattern, not something to apply to yourself in a mirror. Wear has several causes, they combine, and distinguishing them takes an examination — often with photographs or models taken so that change can be measured over time.
Reflux, including the kind people don’t notice
Gastro-esophageal reflux is common and does not always produce heartburn. Reflux that occurs at night, during sleep, may leave nothing more than an occasional sour taste on waking or a sore throat, and some people have no symptoms they would report at all.
Because of that, dentists are sometimes the first to raise the possibility, on the basis of what the teeth look like. If a dentist suggests seeing a doctor about reflux, it is worth taking seriously rather than treating as an odd tangent.
Managing reflux is a medical matter, and it belongs with your physician. The dental side is about limiting the damage while that’s addressed and monitoring whether the wear is progressing.
Vomiting, and a subject that needs handling carefully
Repeated vomiting from any cause has the same effect: severe morning sickness in pregnancy, certain gastrointestinal conditions, some medical treatments, alcohol use, and eating disorders involving purging.
Dentists do sometimes see the physical evidence of an eating disorder before anyone else does, and it is a difficult conversation on both sides. What I would want anyone reading this to know is that the appropriate response from a clinician is not judgment. It is a private conversation and, where the person is willing, help finding proper medical and psychological support, because the dental damage is a consequence and the cause is what needs treatment.
If that is your situation, the dental part can be dealt with in its own time. Please make sure the rest of it reaches someone who can help.
Limiting the damage in the meantime
Brushing immediately after vomiting or after a reflux episode is generally not advised, because the surface has just been acid-softened and brushing at that moment removes more than it otherwise would. Rinsing with plain water is what is usually suggested instead.
Beyond that, what is appropriate depends on the person: the frequency of exposure, how much wear is already present, whether the teeth are sensitive, and what is being done about the medical cause. There are protective measures a dentist can put in place and monitoring arrangements that make sense, and they are decided individually rather than from a list.
The one general statement I am comfortable making is that this should not be self-managed. Wear from stomach acid can progress quickly, it is irreversible, and it is one of the clearest examples of a dental problem whose solution lies mostly outside dentistry.
Common questions
I get heartburn occasionally. Should I worry about my teeth?
Occasional heartburn is unlikely to be the main threat to your enamel, but mention it at your next appointment so it can be noted and the surfaces looked at. Frequent or nightly symptoms are worth raising with a doctor for reasons beyond your teeth.
Can a mouthguard protect against acid erosion?
Appliances are used in some situations, though their purpose and design differ from a guard worn for grinding, and whether one helps depends on the pattern and cause. It is a clinical decision rather than something to buy off a shelf.
Will my dentist tell anyone what they find?
Dental records are confidential in the same way medical records are. A dentist raising a concern about reflux or about vomiting is starting a private conversation with you, and what happens next is your decision.
Dental Surgeon, Dr. Shruti Goel
Dr. Shruti Goel is a dental surgeon in practice since 2006 — around 20 years of clinical work — at Advanced Dental Clinic in Faridabad. She writes here about hygiene and prevention: the part of dentistry that happens at home, between appointments, and that decides how much of the rest is ever needed.