We recommend using a sodium fluoride gel to help prevent tooth decay while you are wearing braces. This gel kills bacteria and replaces minerals in the tooth enamel that have been removed by harmful acids. Using a fluoride gel does not replace daily brushing and flossing, but it should be applied following your daily schedule at bedtime. Place a small strip of the gel on a toothbrush, and apply it to your teeth for one minute. Then spit it out. Do not eat or drink for 30 minutes afterward. It is important for the active ingredient to stay on your teeth for 30 minutes, so do not wash it away by eating, drinking or rinsing.