What GLP-1 Weight-Loss Medication Does to Your Teeth
Two things, mostly. These medicines commonly cause a dry mouth, and saliva is what neutralises acid and repairs early damage all day long — so less of it means decay starts more easily. And nausea is common while the dose is being raised; if that turns into being sick, stomach acid reaches your teeth and dissolves enamel, usually on the inside surfaces of the upper front teeth where you cannot see it. Neither is a reason to stop anything. Both are manageable, and much easier to manage early than to repair later.
Why a dry mouth matters more than it sounds
Saliva is not just comfort. It buffers acid within minutes of a meal, it carries the calcium and phosphate that repair the first stages of damage before they become holes, and it physically washes the mouth. Someone making less of it loses all three at once.
The practical effect is that decay can appear in places and at a pace that would not have happened before — around the gumline, at the edges of existing fillings, and between teeth. People often describe it as their teeth suddenly going downhill. It is not sudden; it is the repair side of the equation being switched off.
Dry mouth is one of the most frequently reported side effects of these drugs, and it lasts as long as you are taking them.
The acid, if you are being sick
Nausea is common while the dose is being increased, and some people vomit. Stomach acid is far stronger than anything in food, and it reaches surfaces that food and drink largely miss: the inside of the upper front teeth, and the biting surfaces of the back teeth.
That is why this damage is usually invisible to the person it is happening to. You cannot see the inside of your own front teeth. What people eventually notice is that the edges have gone see-through, or that the teeth feel sharper, or sensitive to cold.
If you are being sick, the single most useful thing is counter-intuitive: do not brush straight afterwards. Enamel is softened for a while and brushing it in that state removes more of it. Rinse with plain water, or with a teaspoon of bicarbonate of soda in a glass of water, and leave brushing for an hour.
The quieter one: how eating changes
Appetite drops, meals get smaller, and the pattern of eating changes. For teeth, how often you eat matters more than how much — every exposure starts an acid episode that takes time to recover from.
The common trap is managing nausea with frequent small sips of something sweet, or sucking sweets, through the day. That is a worse pattern for teeth than a large meal, and it arrives at the same time saliva is reduced. Plain water, and keeping anything sweet to mealtimes, removes most of the risk at no cost.
What we actually do about it
Nothing dramatic. We look at the surfaces where this shows first, including the inside of the upper front teeth, and we photograph and measure them so there is something to compare against next time rather than an impression.
Where saliva is low we go through what helps — water, sugar-free gum to stimulate flow, and products that substitute for saliva overnight. Where there is early damage we would rather remineralise and watch it than drill it, which is the same approach we take to early decay in anyone.
If enamel has already been lost, it is bonded back conservatively rather than crowned. Eroded front teeth are one of the clearest cases for adding material to what is left instead of cutting the tooth down to take a crown.
We would usually suggest being seen a little more often while the dose is going up, because that is the window when being sick is most likely.
What we will not do
We will not advise you on the medication. Whether to take it, what dose, whether to continue — those are for the doctor who prescribed it, and we will say so if you ask. We do not prescribe or supply these drugs and have no view on whether you should be on one.
We also will not tell you that the medicine is damaging your health in some general way. What we can speak to is your mouth, which is a narrower claim and the only one we are qualified to make.
Questions
Does Ozempic really affect your teeth?
Not directly — it does not act on teeth. It affects them through two side effects: a dry mouth, which removes saliva's protection against decay, and nausea or vomiting, which brings stomach acid onto enamel. The same applies to Wegovy, Mounjaro and other medicines in the group.
Should I stop taking it to protect my teeth?
That is not a dental decision and we would not make it. The dental problems are manageable while you stay on the medicine, which is the point of raising them. Any question about the medication itself belongs with your prescriber.
Why do my teeth feel sensitive on GLP-1 medication?
Usually one of two things. A dry mouth leaves teeth less protected and more reactive to cold. Or acid has thinned the enamel, which exposes the layer beneath. The second is worth looking at properly, because thinned enamel does not grow back.
I have been sick a few times. Should I come in?
If it was a handful of times, keep an eye on it and mention it at your next visit. If it has been going on through several weeks of dose increases, it is worth being seen, because the damage happens where you cannot see it and is far cheaper to stop than to repair.
Can the damage be reversed?
Early damage, yes — enamel that has been softened but not lost can be remineralised. Enamel that has actually dissolved away does not come back, and is replaced with bonded material. Which of the two you have is the thing worth finding out early.