Eligibility Criteria | |
---|---|
Inclusion Criteria | Exclusion Criteria |
were aged between 18 to 30 years old | had dentin hypersensitivity |
had good general and oral health | had congenital enamel defects |
had caries-free anterior teeth | had visible cracks on enamel |
had anterior-free restorations | had periodontal disease |
had canines with shade A2 or darker | had a previous bleaching procedure |