Fluoride gets absorbed from drinking water, but 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 prescription or the dentist can also apply fluoride to the teeth as a gel.

These treatments contain a much higher level of fluoride than the amount found in toothpastes and mouth rinses. Gels can be painted on or applied via a mouth guard, but care is required in children to ensure the gel is not swallowed.