They contain heavy staining substances, which can prevent optimal whitening.

Avoid tobacco, coffee, colas and red wines.Some Tips For The Most Successful Results. Store your whitening trays in their case, away from children and pets.Place trays in mouth for 5 minutes.Do not swallow fluoride, spit out any excess.Place a small amount of fluoride in trays (Prevident Gel).After 4-6 hours, remove and clean the trays with cold water.Keep the tray in your mouth for 4-6 hours.After 30-60 minutes, remove and clean the trays with cold water.Keep the tray in your mouth for 30-60 minutes.Remove any excess gel from the gum tissue with your finger or dry toothbrush.Place the tray in your mouth carefully, making sure that it is seated all the way.Place a small amount of whitening solution into tray.