Fluoride

Fluoride is a naturally occurring mineral that is widely used in dental care because of the way it supports tooth enamel. It is found in most toothpastes, in some water supplies, and in treatments a dentist can apply. Its role is preventive: it helps protect teeth against decay rather than treating decay that has already formed a cavity.

Fluoride works in the mouth by helping the enamel take up minerals again after the everyday acid attacks that come from eating and drinking, and by making the enamel more resistant to those acids.

Teeth go through a constant cycle of losing and regaining minerals. When the balance tips too far towards mineral loss, early decay can begin. Fluoride helps shift the balance back, supporting remineralisation of the enamel and making it harder for acids to cause damage. This is why it is a cornerstone of decay prevention.

Fluoride is used as directed, and the right amount differs by age, which is why children's toothpaste and brushing advice are tailored to younger users and why young children are supervised when brushing. A dentist can advise on what is appropriate for you or your child, including whether a professional fluoride application would be helpful.

As with anything, more is not automatically better, and following the guidance on toothpaste and any treatment is part of using fluoride well. If you have questions about fluoride for your family, a dentist is a good source of tailored advice.

For most people, the main everyday source of fluoride is toothpaste. Brushing twice a day with a fluoride toothpaste gives the teeth regular, low-level exposure, which is what helps the enamel resist acid and remineralise early damage over time.

In some places fluoride is also present in the drinking water, either naturally or because it has been added at a controlled level as a public-health measure. Together, these everyday sources provide a steady background of protection that supports the teeth between dental visits.

A dentist can also apply fluoride directly to the teeth in the clinic, usually as a varnish or gel, at a higher concentration than everyday toothpaste. This is a quick, straightforward step that is sometimes suggested for people at higher risk of decay, including some children.

Whether a professional application would help depends on your individual risk and needs, which is something a dentist assesses. For many people, everyday fluoride toothpaste is enough, while for others the extra protection is worthwhile.