Medicinal Poly-rin Dental Rinse. Unopened set of 3 bottles, 500ml each. ＜Effects and Benefits＞ Whitens teeth, prevents the deposition of tartar, removes tobacco stains, prevents periodontitis (pyorrhea), prevents gingivitis, prevents the occurrence and progression of cavities, purifies the mouth, freshens the mouth ＜Directions＞ Take about 4 pumps (12-16ml) into your mouth, rinse for about 20 seconds, and then brush your teeth.