Question: how many times a day can you use crest 3d white strips?
Answer: Can I Use More than 2 Sets of Whitestrips a Day? Extensive clinical and consumer testing was done to establish the safety and efficacy of Crest 3D White Whitestrips. However, based on the results of that work we do not recommend using more than 2 upper strips and 2 lower strips in a day.