Asked by: Ash Class, Bosmere Primary School, Ipswich
Research on children aged 6 to 14 has found a large reduction in tooth decay when using a fluoride-based mouthwash.
However, all the trials gave the mouthwash to children in a supervised setting at school, in between teeth brushings. There’s no evidence that a quick rinse at the same time as you brush your teeth provides any extra benefit.
So a rinse during lunchtime could be beneficial, but children are recommended to check with their dentist before using mouthwash.
Subscribe to BBC Science Focus Magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun facts.