Espositori

Fluoride is found in foods and in water. It can also be directly applied to the teeth through fluoridated toothpastes and mouth rinses. Mouth rinses containing fluoride in lower strengths are available over-the-counter; stronger concentrations require a doctor's prescription.

A dentist in his or her office can also apply fluoride to the teeth as a gel, foam, or varnish. These treatments contain a much higher level of fluoride than the amount found in toothpastes and mouth rinses. Varnishes are painted on the teeth; foams are put into a mouth guard, which is applied to the teeth for 1 to 4 minutes; gels can be painted on or applied via a mouth guard.

People with certain conditions may be at increased risk of tooth decay and would therefore benefit from additional fluoride treatment. Such conditions include:

• Dry mouth conditions: Dry mouth caused by diseases such as Sjögren's syndrome, certain medications (such as allergy medications, antihistamines, anti- anxiety drugs, and antihypertensives) and head and neck radiation treatment makes an individual more prone to tooth decay. The lack of saliva makes it harder for food particles to be washed away and acids to be neutralized.
• Gum disease: Also called gingivitis, gum disease can expose more of your tooth and tooth roots to bacteria increasing the chance of tooth decay.
• History of frequent cavities: If you have one cavity every year or every other year, you might benefit from additional fluoride.
• Presence of crowns and/or bridges or braces: These treatments can put teeth at risk for decay at the point where the crown meets the underlying tooth structure or around the brackets of orthodontic appliances.