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

https://martinvddt734.iamarrows.com/do-whitening-strips-really-work-a-dental-professional-s-viewpoint

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