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

https://telegra.ph/How-to-Whiten-Your-Teeth-Before-a-Major-Event-or-Wedding-Event-04-15

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