 These trays will be coated with the gel every 2 weeks, for a 12-week period. You will hold the trays with the gel in your mouth for at least 5 minutes, usually at night or in the morning. You should not eat or drink during these 5 minutes in order to increase the effectiveness of the gel on your teeth. You will apply the gel at home, for one 5-minute application, on Weeks 2, 4, 8 and 10. You will be given a diary to list each time that you use the gel at home, and to list if you experience any side effects. You will have office visits on Weeks 6 and 12. The dentist will floss between all of your teeth during these office visits. You will also use the gel, for two 5-minute applications, during these office visits. You will also need to bring the completed diary to each office visit. 