Question: how to whiten your teeth with gel?
Answer: Prior to Treatment: Brush and floss just prior to bleaching your teeth. ... 
Applying the Bleaching Gel: When you apply the gel make sure not to fill the trays. ... 
Inserting the Bleaching Trays: Insert whitening tray in the mouth over the teeth. ... 
Wearing Time: We recommend wearing the tray with the bleach for 2 hours.