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

https://blogfreely.net/dernesvhbz/can-you-bleach-teeth-with-braces-a-guide-to-timing

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