Brushing activates them to generate a blue foam that provides a temporary effect Brush teeth for 2 minutes, 3 times daily. Children 6 years and younger should only use a pea sized amount, and be supervised by an adult to minimize swallowing In case of intake of fluoride from other sources consult a dentist or doctor. Do not swallow. Spit and rinse thoroughly after brushing. The formula contains clinically proven optic brighteners Sodium Fluoride 0.32% w/w (1450 F-)