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

https://www.mediafire.com/file/3k0h3edyv2e206x/pdf-62479-872.pdf/file

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