If you clench or grind, discuss it before whitening; enamel wear and exposed dentin can increase sensitivity
https://www.animenewsnetwork.com/bbs/phpBB2/profile.php?mode=viewprofile&u=1173372
If you clench or grind, discuss it before whitening; enamel wear and exposed dentin can increase sensitivity, requiring customized protocols and gentler gels.