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

https://andersonwmsf170.yousher.com/why-expert-whitening-is-safer-for-your-enamel-2

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