Flouride is a mineral that binds to and strengthens enamel and thereby protects it against cavities and sensitivity. Generally for toothpaste, it is important to know how abrasive/gritty it is, and to choose one with a low RDA. For standard use, any low abrasive fluoride toothpaste is good. For enamel that has acid erosion, pronamel. For general sensitivity, we like repair and protect. For severe or localized sensitivity, rapid relief. For cavity prone adults, choose a higher mineral toothpaste such as prevident. Xylitol is a cavity fighting ingredient that works by neutralizing the bacteria in the mouth. As it is a sugar, the bacteria try to use it as a food source, but in fact they can’t metabolise xylitol. This results in a lower level of cavity-causing bacteria, and a higher level of friendly bacteria which only gets better with time. We particularly like Remin for adults with acid erosion.