- Chemically activated, so no light is needed. - Powerful 40% hydrogen peroxide gel. - Opalescence tooth whitening gel contains PF (potassium nitrate and fluoride). - Fresh chemical for each application. - Precise delivery. - Easy to see for complete removal. - Two to three 20-minutes applications. - Thicker formula prevents the gel from running. - No refrigeration required prior to mixing. - Bleaching syringes only. **For further product information , please contact Chat support**