Fluoride/ˈflɔːraɪd,ˈflʊraɪd/ Definition 1 of 2Pro Tip 1/3Health Association The word 'fluoride' is often linked with dental health and hygiene. My dentist says that fluoride strengthens tooth enamel. Pro Tip 2/3Consumer Products 'Fluoride' appears in the list of ingredients for oral care products. Check the label for fluoride when buying mouthwash. Pro Tip 3/3Preventive Care Fluoride is highlighted as a protective measure against tooth decay. Fluoride varnish can prevent early signs of dental caries.