Prevention, Hygiene & Lifestyle
Fluoride
Fluoride strengthens enamel and helps protect your teeth from decay.
What it does
Strengthens enamel
Main source
Toothpaste
In-clinic
Varnish or gel
Safety
Safe as directed
Overview
Fluoride is a natural mineral that makes tooth enamel more resistant to acid. It can even help repair very early decay before a hole forms.
You get fluoride from toothpaste, tap water in many areas, and treatments at the clinic. Used as directed, it is safe and effective.
What to know
- Strengthens enamel against acid attack
- Can reverse very early decay
- Found in toothpaste and most tap water
- Stronger treatments are available at the clinic
Common questions
Is fluoride safe?
Yes, when used as directed. The amounts in toothpaste and water are well studied and safe.
Does my child need fluoride toothpaste?
Usually yes, in the right amount for their age. Ask your dentist how much to use.
What is fluoride varnish?
A concentrated coating painted on the teeth to give extra protection, often used for higher decay risk.
Do I still need it if my water is fluoridated?
Yes. Brushing with fluoride toothpaste adds direct, ongoing protection.
Related topics
Brushing technique
Brushing twice a day removes the plaque that causes decay and gum disease.
Diet, sugar & acid
What and how often you eat and drink shapes your risk of decay and erosion.
Tooth decay
Damage to the tooth caused by acid from plaque bacteria.
Fissure sealants for children
A protective coating on back teeth helps stop decay starting in the grooves.
Dr Rick Iskandar · Reviewed June 2026