An impression is taken to make a specialized “trays” to hold the bleaching agent against the teeth. In a few days your custom bleaching trays will be ready for you to pick up from our surgery. Drs. Wong or Cheng will advise you on how long you should wear each application as well as providing you with specific instruction on how to place the bleaching agent into the clear trays. A recent study showed that you can achieve an average improvement of six shades* after just three nights of use.