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

https://beckettocln150.image-perth.org/why-professional-whitening-is-safer-for-your-enamel-2

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