Fluor-Kin Calcium Strawberry flavour mouthwash has optimal concentration of 224ppm Fluoride to help prevent caries in children. The unique combination of Calcium and Fluoride is proven to increase enamel remineralisation by 16% more than a mouthwash containing Fluoride alone. As the pH in your mouth drops, the acidity causes more damage to the teeth. The surfaces of the teeth begin to be affected at a pH of about 6.5, but major enamel decay begins when the pH drops below 5.5. By contrast, an alkaline environment in the mouth can help remineralise teeth, which repairs tooth decay.