If you clench or grind, discuss it before whitening; enamel wear and exposed dentin can increase sensitivity

https://manuellinq708.huicopper.com/foods-that-stain-your-teeth-and-how-to-fight-them

If you clench or grind, discuss it before whitening; enamel wear and exposed dentin can increase level of sensitivity, needing personalized protocols and gentler gels.