Fluoride varnishes are safe and used by dentists and doctors around the world to help prevent tooth decay in children. Only a small amount, almost no fluoride was swallowed. It is quickly applied and hardened. Then brush off after 4 to 12 hours. Some brands of fluoride varnish yellow teeth. Other brands make teeth look boring. However, your child's teeth will return to normal color when the fluoride varnish is brushed off. Most children like the taste.
