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

https://zanderckjg432.timeforchangecounselling.com/whitening-for-sensitive-teeth-how-we-minimize-discomfort

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