Too much loss of flouride leads to tooth decay. The addition of these flouride helps to keep your enamel strong and safe from decay. Second, fluoride helps to control the acid inside your mouth.
Fluoride varnishes painted onto teeth twice a year can help reduce the chances of decay.
Please try not to drink anything hot, like tea or coffee, or eat sticky foods for 3-4 hours.As it will remove the applied flouride gel from the tooth surface.
Most of the non-sticky foods will not affect the fluoride treatment and can be eaten immediately after your appointment.