Do my teeth need to be dry before doing the treatment? June 07, 2023 13:30 Updated Yes, after brushing your teeth, dry them with a paper towel or tissue. Related articles How do I use the pen? How do I ensure proper fit? Do I apply the pen on the tray or on my teeth? After one use of the pen, the bristles are stuck together and gel does not seem to come out, what should I do? Will the light get hot during use? Comments 0 comments Article is closed for comments.