The fluorides that can be used for caries prevention are: 2% sodium fluoride solution, 8% stannous fluoride, 4% sodium fluorophosphate solution or gel, 10% ammonium fluoromolybdate solution and 38% ammonium silver fluoride solution, etc. Why do you choose fluoride as anti-caries drug? 1.Because it can enhance the acid resistance of dentin and promote the remineralization of caries; 2.Because it inhibits the effect of bacteria and enzymes. However, the focus of drug coating is different for children of different ages: 1. At the age of 1, the drug coating of the anterior milk teeth can effectively inhibit the caries of the maxillary anterior milk teeth; 2. At the age of 2, the drug coating of the milk molars; 3. At the age of 3, the milk teeth have formed, continue to regularly left drug coating to control the caries of the milk teeth; 4. At the age of 6, the drug coating of the first permanent molars (i.e. the sixth age teeth) is the focus to increase its anti-acid. Cautions when applying the drug: 1.Clean the tooth surface; 2.Strictly isolate the wet; 3.Application time about 4 minutes; 4.No rinsing or eating within half an hour after application. Knowing the above, parents will not be helpless to their children’s tooth decay, right?