After vomiting, you should rinse your mouth with water (or a baking soda rinse) and wait about 30 minutes before brushing, because stomach acid temporarily softens enamel and brushing straight away can scrub that softened surface away. Stomach acid has a pH of around 1 to 2, which is strong enough to erode tooth enamel if it contacts your teeth repeatedly.
A single episode of vomiting from a stomach bug will not usually harm your teeth. Repeated vomiting is different, whether it comes from morning sickness, a medical condition or other causes, and protecting your teeth during that time is worth planning for.
Key takeaways
- Stomach acid can soften enamel within minutes of contact.
- Rinse with water or a mild baking soda solution straight away, then wait around 30 minutes to brush.
- Use a fluoride toothpaste and a soft toothbrush once you do brush.
- Frequent vomiting, including from morning sickness, increases the risk of erosion.
- Tell your dentist about ongoing vomiting so they can help protect your teeth.
Why does vomit damage teeth?
Enamel starts to dissolve when the pH in your mouth falls below around 5.5. Vomit is highly acidic because of the hydrochloric acid in the stomach. It coats the teeth, particularly the inner (tongue-side) surfaces of the upper front teeth, which are the first to be hit. Over weeks and months of repeated exposure, enamel can thin, teeth can become sensitive and the edges of the teeth can look worn.
What to do straight after vomiting
- Rinse with water. Swish and spit several times to dilute the acid.
- Use a baking soda rinse if you can. Mix about half a teaspoon of baking soda in a cup of water. It helps neutralise acid.
- Do not brush yet. Wait around 30 minutes.
- Then brush gently. Use a soft brush and fluoride toothpaste.
- Leave the fluoride on. Spit out the foam but avoid rinsing heavily with water afterwards.
- Use a fluoride mouthwash later in the day if your dentist recommends it, as it can help re-harden the surface.
If you cannot brush later, rubbing a small amount of fluoride toothpaste over the teeth with a clean finger is better than nothing.
Morning sickness and your teeth
Many pregnant women experience nausea and vomiting, and a smaller number have severe vomiting. Pregnancy also changes the gums, which can bleed more easily. Our guides on dental care during pregnancy and gum disease and pregnancy gingivitis cover this in more detail. If brushing triggers nausea, try a small-headed brush, a mild-flavoured toothpaste or brushing at a time of day when you feel best.
Other causes of repeated acid exposure
| Cause | How it affects teeth | What can help |
|---|---|---|
| Morning sickness or hyperemesis | Short bursts of strong acid, often daily | Rinse, delay brushing, fluoride, dental review |
| Acid reflux (GORD) | Acid reaches the mouth, often at night | Medical management, see acid reflux and teeth |
| Gastro illness | Short term exposure | Rinse and wait before brushing |
| Eating disorders or other medical conditions | Repeated acid and often dry mouth | Medical support plus dental care without judgement |
| Medication side effects | Nausea or dry mouth raising risk | Talk to your doctor and dentist |
If vomiting is ongoing for any reason, it is worth speaking with your GP as well as your dentist. Dental teams provide care without judgement, and early advice can protect your teeth.
How a dentist can help
A dentist can check for early erosion, recommend a fluoride product to strengthen enamel and suggest how to manage sensitivity. Where wear has progressed, treatments such as bonding or crowns may be considered later, once the underlying cause is under control. Our overview of enamel erosion explains the stages of wear.
Frequently asked questions
Should I brush my teeth after throwing up?
Rinse first, then wait around 30 minutes before brushing. This gives saliva time to start re-hardening the enamel.
Is baking soda safe to rinse with after vomiting?
Yes, a diluted baking soda rinse is commonly recommended to neutralise acid. Do not scrub with it dry.
Can one episode of vomiting damage teeth?
A single episode is unlikely to cause lasting harm. The risk builds with repeated exposure.
Why do my teeth feel rough after being sick?
The acid temporarily softens the surface, so it can feel gritty. It usually settles as saliva restores minerals.
Will morning sickness ruin my teeth?
Not necessarily. Rinsing, delaying brushing, using fluoride and keeping dental check-ups can limit the risk.
Support for your teeth
If you have been dealing with frequent vomiting, a dental check can reassure you or catch problems early. The team at Lumi Dental offers general dental care, and new patient information is on our current deals page.
This article is general information and does not replace advice from your doctor or dentist.
