Efficacy of Two Sonic Toothbrushes in Reducing Extrinsic Tooth Stain

The inclusion criteria were: 1) aged 18-70 years; 2) good general health; 3) ability to attend all scheduled visits over the 8-week study period; 4) possession of more than 20 natural permanent teeth, excluding third molars, which are free of crowns or extensive restorative materials; 5) at least 12 anterior teeth suitable for scoring (i.e., free of crowns, veneers, large restorations, trauma, or non-vital pulp); 6) a whole-mouth mean Lobene stain composite score greater than 1. Exclusion criteria included: 1) severe oral or systemic diseases; 2) advanced periodontal diseases; 3) pregnancy or lactation; 4) dental fluorosis or tetracycline staining; 5) orthodontic appliances or partial removable dentures; 6) participation in other clinical trials; 7) professional prophylaxis within 3 months or tooth whitening within 6 months; and 8) known allergy to study products.