Dental problems on these medications come from two things: acid reaching your teeth through reflux or vomiting, and a drier mouth from reduced fluid intake. Enamel does not grow back, so the useful window is early. The single most valuable habit is not brushing straight after acid exposure, which is the instinct and the wrong move.
After vomiting or reflux, rinse rather than brush. Water, or water with a little baking soda, neutralises acid. Brushing while enamel is softened by acid scrubs it away. Wait around half an hour before brushing.
For how this fits alongside the other effects of these medications, see GLP-1 Side Effects: The Complete Management Guide.
What is actually happening
Stomach acid is strong enough to soften enamel. Reflux brings it up to the teeth, particularly at night when lying flat, and vomiting delivers it directly.
Saliva is your defence. It neutralises acid and carries minerals that help enamel recover. A drier mouth means less of that protection, and reduced fluid intake makes a drier mouth.
Erosion from acid looks different from ordinary decay. It tends to affect the backs of upper front teeth and the biting surfaces, and it develops as a general thinning rather than a hole.
Dry mouth
Sip water through the day, which helps for several reasons beyond your teeth. Sugar-free gum stimulates saliva, and xylitol-containing gum is often recommended, though it can add to bloating for some people here.
Breathing through your mouth at night worsens it. If you snore heavily or wake with a very dry mouth, that is worth mentioning, since it may point at sleep apnea.
Alcohol-free mouthwashes are gentler than alcohol-based ones when your mouth is already dry.
Reflux at night
Night-time reflux is worse for teeth because saliva production drops during sleep, so acid sits longer with less to counter it.
The same measures that help reflux generally help here: a gap between your last meal and lying down, and raising the head of the bed rather than stacking pillows.
Practical protection
A soft brush and fluoride toothpaste. Some people are advised to use a higher-fluoride product, which a dentist can prescribe.
Spit rather than rinse after brushing, so the fluoride stays in contact longer.
Watch what you sip. Constant grazing on acidic or sugary drinks, including sugar-free fizzy ones, keeps teeth under acid attack all day. Electrolyte drinks are often acidic too, which catches people who are using them for good reasons.
Tell your dentist
Mention that you take a GLP-1, whether you have reflux or vomiting, and roughly how often. It changes what they look for and how frequently they want to see you.
If you have not been for a while, going near the start of treatment gives a baseline worth having.
The acid comes from reflux and vomiting, so treating those protects your teeth as well. Electrolyte drinks are often acidic, which matters if you sip them through the day rather than during an episode, as electrolytes notes.
Frequently asked questions
Do these medications damage teeth directly?
Not directly. The routes are acid exposure and dry mouth, both of which are manageable.
Why should I not brush after being sick?
Acid softens enamel temporarily. Brushing then removes softened surface. Rinse first, brush later.
Does sugar-free gum help?
It stimulates saliva, which protects teeth. Some people find it adds to bloating.
Are electrolyte drinks bad for teeth?
Many are acidic. Useful during fluid loss, but not something to sip continuously.
Can eroded enamel be repaired?
Lost enamel does not regrow, though early softening can remineralise and a dentist can restore damaged surfaces.
How often should I see a dentist?
More often than usual if you have regular reflux or vomiting. Ask them to advise based on what they find.