Yes when applied at the correct dose, fluoride varnish is safe.
Children can have fluoride varnish applied up to four times per year. Children taking part in Designed to Smile may have fluoride varnish applied twice a year in school or nursery. If your child has had fluoride varnish applied in school, it is a good idea to tell your dentist so that they can space out other applications to increase the benefit.
Children who swallow too much fluoride can develop white spots on their teeth. That’s why it is important not to let your child eat toothpaste. Fluoride varnish is applied at school only twice a year therefore the risk of developing white spots as a result is tiny.
If your child normally takes fluoride drops or tablets, they should not receive fluoride varnish applications at nursery or school.