A patient of mine spent eight months on tirzepatide, was delighted with the result, and then needed four crowns. Nobody had connected the two, including her dentist, until she mentioned the medication in passing.
Enamel does not grow back. Of all the side effects in this class, this is the one where a small amount of foresight prevents a permanent and expensive problem.
The erosion problem
Stomach acid sits at a pH low enough to dissolve enamel. That is not a gradual wear process; it is chemistry, and it is one-way.
Two routes on this drug class:
Vomiting. Obvious, episodic, and most likely in the weeks after each dose increase. Anyone who has had a bad titration has exposed their teeth to acid repeatedly.
Reflux. Less obvious and arguably more damaging, because it is chronic. Acid reaching the mouth during sleep, night after night, produces the pattern dentists recognise — erosion concentrated on the palatal surfaces of the upper front teeth and the biting surfaces of the molars. Many people have no idea it is happening. The mechanical fixes are in reflux on a GLP-1.
Dry mouth compounds both. Saliva neutralises acid, buffers pH and clears bacteria. Reduced fluid intake means less of it, exactly when you need it most — see dehydration and your kidneys.
pH 5.5
Below which enamel begins to demineralise — stomach acid is far below it
One-way
Enamel does not regenerate; erosion is permanent
Palatal surfaces
Where acid erosion characteristically shows first, on the upper front teeth
What to actually do
Never brush straight after vomiting. This is the single most useful sentence on this page and it is counterintuitive. Acid softens enamel temporarily; brushing then scrubs it off. Wait thirty minutes.
Rinse instead, immediately. Water, a fluoride mouthwash such as ACT, or a teaspoon of bicarbonate of soda in a glass of water to neutralise the acid.
Use a fluoride toothpaste, and consider a high-fluoride one. Your dentist can prescribe a higher-strength paste if erosion is present. Sensodyne and similar formulations help with the sensitivity that erosion causes, though sensitivity relief is not the same as protection.
Treat the dry mouth. Sipping water through the day, sugar-free gum to stimulate saliva, and a dry-mouth product — Biotène rinse or XyliMelts overnight — if it is persistent.
Do not sip acidic drinks all day. Fizzy water, citrus, sports drinks and vinegar-based products all lower oral pH. If you have started drinking apple cider vinegar because the internet suggested it, that is a direct enamel risk — one of several reasons to read the “natural Ozempic” question.
Rinse after electrolyte drinks. Many are acidic. Useful for hydration, and worth a mouthful of plain water afterwards.
See a dentist while it is early. Erosion is far cheaper to arrest than to restore.
Sedation, which is the safety issue
This is the part most people have not considered.
The 2023 and 2024 perioperative guidance on GLP-1 medications applies to any procedure involving sedation or general anaesthesia, and that includes dental work. Delayed gastric emptying means the stomach may still hold food after standard fasting, which raises the risk of pulmonary aspiration.
A routine filling under local anaesthetic is unaffected — no fasting, no sedation, no issue. What needs the conversation is anything under intravenous sedation or general anaesthesia: wisdom teeth, implants, extensive surgical work, or treatment under sedation for dental anxiety.
The nutritional angle
Two smaller points worth knowing.
Reduced intake means reduced calcium and vitamin D for some people, both of which matter for the bone that holds teeth. This shows up on bloodwork if anyone looks.
And people managing nausea frequently graze on crackers, boiled sweets or ginger chews through the day. Constant carbohydrate exposure without saliva to clear it is a decay risk that the same person would never accept from ordinary snacking. If you are using something for nausea, use it in defined episodes rather than continuously — see is this nausea normal and what to eat on a GLP-1.
The instinct after being sick is to brush immediately. It is the worst possible moment to do it, and nobody is told.
Who should be most careful
Anyone with significant vomiting through titration, anyone with known reflux, anyone who already has erosion or a dry mouth from other medication, and anyone with a history of disordered eating — where the enamel picture may already be established.
The vomiting itself is largely avoidable, incidentally. Holding at a dose rather than escalating on schedule resolves most of it, and the intervals are minimums rather than deadlines — see the GLP-1 dose charts and how long side effects last.
The three habits
Rinse rather than brush after being sick, and wait half an hour. Keep the fluid up so you still make saliva. And tell your dentist what you are taking, before they find out from your enamel.