This isn't really something new - it's been known for a long time that fluoride needs to be on the surface of the teeth to work. In jested fluoride doesn't do a

This isn't really something new - it's been known for a long time that fluoride needs to be on the surface of the teeth to work. In jested fluoride doesn't do anywhere near as much. So fluoride toothpaste, or even better fluoride rinse's are much more effective.