A technician spends three to five minutes air-drying his teeth and applying a 10% stannous fluoride solution.
As a substitute, considerable benefit can come from having a dentist paint children's teeth with stannous fluoride every three years.
Finn Brudevold of Harvard's famed Forsyth Dental Center is concerned that the tin in the stannous fluoride solution commonly used for painting may interfere with the absorption .