Topical fluoride treatments given to adults have a significant, positive impact on the oral health of adults at moderate to high risk for cavities. There are a growing number of reasons why adults should receive fluoride treatments. These include a rise in prescription medication use and an increase in restorative dental work. Application is quick and non-invasive and the fluoride varnish quickly dries to create a smooth clear surface. It remains on the teeth for several hours before being brushed off.