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

https://www.mediafire.com/file/m1mcreyappe4crf/pdf-11427-7263.pdf/file

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