In recent years, the general school and many families are equipped with bottled water dispensers, bottled water dispensers, although the daily drinking water has brought a lot of convenience, but the latest research by foreign scientists has revealed the bottled water dispensers an undesirable effect: often drink bottled water (pure water) children will greatly increase the risk of tooth decay (dental caries). According to the newspaper: Australian Oral Health Research Center researchers in the relevant research study found that: 14-15-year-olds with permanent tooth decay in six years increased by 71%. The researchers made it clear that this had a lot to do with the popularity of bottled water and sports drinks in the 1990s. The reason for this is that ordinary bottled water contains little or no calcium, phosphorus, or other minerals, and lacks fluoride, which strengthens tooth enamel, the translucent calcified tissue that covers the outermost portion of the tooth, leading to a significant increase in the risk of cavities in children. This is because minerals such as calcium, phosphorus and fluoride are important for promoting tooth growth and protecting dental health. Calcium and phosphorus are the main raw materials that make up teeth, and about 99% of the body’s calcium is concentrated in the bones and teeth. Whether it is infants or adolescents, if the calcium is not enough to meet the needs, or if the calcium that has been ingested into the body is not absorbed and utilized by the body for a variety of reasons, the strength of the teeth will be affected. Teeth due to lack of calcium will become loose, easy to be corroded by bacteria in the mouth and generate caries. Fluoride in fluoride can penetrate into the enamel on the surface of the tooth, forming a fluorescent phosphor-ash material, acid resistance, thus playing a role in strengthening the teeth, fighting bacteria, and protecting the oral cavity. Fluorine is found in all tissues of the human body, but it also accumulates mainly in the teeth and bones. This has been confirmed in epidemiological surveys: in countries with increased rates of dental caries, there is also a higher prevalence of enamel hypoplasia. After discovering this, many countries have added fluoride to tap water in appropriate amounts so that people can protect their teeth while drinking water. Of course, too much fluoride in the water is not good, otherwise it will cause dental fluorosis, also unfavorable to dental health. Our country stipulates that the fluoride concentration in drinking water is less than 1.0 mg/liter. Calcium, fluoride, etc. is one of the essential minerals and trace elements, and water is an important way for the body to obtain these substances. In special circumstances conditions or the main source. Therefore, experts suggest that parents usually best to limit the children to drink too much bottled water, to drink tap water. Schools should create the conditions as much as possible, so that students can drink clean and hygienic water, in order to facilitate their intake of relevant essential minerals such as trace elements from drinking water, to ensure dental and physical health.