Adult Fluoride Treatments In the past, it was generally accepted that fluoride should be mainly used for children whose developing teeth fluoride helped the most. But through the years, more research has been done and fluoride is being shown to help prevent tooth decay in people of all ages. You don’t have to go to the dentist to get fluoride. Many toothpastes and some mouthwashes contain fluoride. Patients that have a more serious risk of tooth decay can be prescribed fluoride treatments that can be used at home. Fluoride, while not the only necessary dental hygiene practice, can work in conjunction with brushing and flossing to help you maintain healthy teeth for a lifetime.