Not only does Fluoride prevent dental decay by making teeth more resistant to acid attacks, but it can also reduce hypersensitivity, especially when there is gum recession.
A professional fluoride treatment is the simplest treatment at the dental office that provides optimal protection and delivers the highest fluoride concentration possible.
After a fluoride treatment is done, it is strongly advised to not eat, drink, or rinse for a minimum of 30 minutes. However in order to achieve maximum results, it is best to leave the fluoride varnish on the teeth for 6 hours.
See websites below on the benefits of fluoride treatments