New data from the UK Health Security Agency show that laboratory-confirmed cases of Norovirus surged to 61% in the two weeks to January 18, compared to the previous fortnight. Dentists are now urging people to avoid the most common mistake after being sick: brushing their teeth too soon.
While the most natural reaction after throwing up is to want to brush away the taste and smell, dental experts say that brushing immediately after can weaken teeth and increase the risk of long-term damage.
Vomiting exposes the teeth to strong stomach acids, which temporarily soften the tooth enamel. Brushing teeth during this period can scrub the acid deeper into the enamel, increasing erosion, sensitivity and the risk of tooth decay.
Dr Bhavika Parekh, General Dental Surgeon at Smile n Shine, says she regularly sees patients unaware of the risks. “It’s a common misconception that brushing immediately after vomiting protects your teeth.
“In reality, the enamel is temporarily weakened by stomach acid, so brushing too soon can worsen wear. Simple measures like rinsing with water or chewing sugar-free gum can help neutralise acid and protect teeth before you brush.”
Dr Parekh went onto share their tips for what to do instead of picking up your toothbrush after being sick.
1. Rinse your mouth gently
Rinsing with plain water helps wash away acid without causing further abrasion. A fluoride mouthwash can also help strengthen enamel during recovery.
2. Wait at least 30–60 minutes before brushing
This gives saliva time to neutralise acids and allows enamel to re-harden, reducing the risk of erosion when brushing resumes.
3. Use fluoride toothpaste when you do brush
Fluoride helps remineralise enamel and provides extra protection after acid exposure.
4. Chew sugar-free gum if needed
Chewing gum stimulates saliva production, which naturally neutralises acid and supports enamel repair.
5. Monitor enamel if vomiting happens frequently
Repeated vomiting can increase enamel wear. Regular check-ups with a dentist help detect early signs of erosion and protect long-term tooth health.
Dr Parekh says this advice is especially important during periods of widespread illness. “During norovirus outbreaks, we often see a rise in patients experiencing sudden tooth sensitivity or enamel wear weeks later. In many cases, it’s linked to brushing too soon after vomiting, rather than poor hygiene.”
