Two weeks before bleaching brush teeth normally with a desensitizing toothpaste like Sensodyne, Crest Sensitivity, Bulter sensitivity or any toothpaste containing fluoride and 5% potassium nitrate. The new generation of remineralizing toothpastes such as Dr. Collins Restore Toothpaste also addresses sensitivity and is highly recommended for both before and after bleaching.
We highly recommend you just bleach the top teeth first i.e. one tray at a time only and also use a low strength percentage of bleaching gel. Use 10% carbamide peroxide (CP) to start.
After brushing for a few days, wear your EMPTY bleaching trays alone for a few hours or even over night.
After wearing the empty trays place Dr. Collins Desensitizing gel in the tray for 1 hour before bleaching. Alternatively some dentists recommend placing SLS-free (foam free) desensitizing toothpaste (original Sensodyne) in the tray and wear at night or during the day a few times..
After comfortable with trays alone or with toothpaste, place the bleaching material in the tray instead of the toothpaste. Please refer to the bleaching instructions: