Discus Nite White and Day White ACP Bleaching Bundle (6 gels)24-7 Tooth WhiteningGet both of the innovative formulas in one package. Reduce sensitivity and enhance results with ACP, Potassium Nitrate and Fluoride.Features: Sensitivity Relief: 3 ingredients to reduce sensitivity Large Multi-Dose Syringes: 3 applications per syringe Enhanced Results: rebuild tooth enamel and add luster Day Time: Use Day White for as little as 30 minutes Night Time: Use Nite White for as little as 1 hour Strength DifferencesHigh Strength: Day White ACP: 9.5% hydrogen peroxide Nite White ACP: 22% carbamide peroxide High power for healthy, non-sensitive teeth 22% can be used for 1 hour Medium Strength: Day White ACP: 7.5% hydrogen peroxide Nite White ACP: 16% carbamide peroxide Medium power for those with moderately sensitive teeth 16% can be worn for 4 or more hours