Invisable braces, clear braces are the clear, discreet alternative to metal braces. A patient generally gets a certain amount of trays that he/she will wear for an average treatment time of 12 months. These trays are worn for 22 hours a day, 2 weeks at a time, and are taken off during meals. After 2 weeks, you slip on your next tray. You should visit us every 4-6 weeks during treatment to check on your progress.