Tooth decay is a common public health problem that affects children. In 2011, responding to a lawsuit by Fluoride Action Network, EWG and Beyond Pesticides, the Department of Health and Human Services recommended that water utilities reduce the amount of fluoride added to tap water by almost half, from 1.2 parts per million, or ppm, to 0.7 ppm. I had an anti-fluoride patient the other day that was saying he read somewhere that a pea-sized amount of toothpaste contains the same amount of fluoride in 1 liter of tap water (1 ppm). This new recommendation took effect in 2015. Norman Tinanoff, in Pediatric Dentistry (Sixth Edition), 2019. Here are our parameters for saline water: Freshwater - Less than 1,000 ppm Optimally Fluoridated Water. 13 Water fluoridation at the level of 0.7-1.2 mg fluoride ion/L part per million fluoride (ppm F) was introduced in the U.S. in the 1940s. - 1 out of 4 elementary school children - 2 out of 3 adolescents - 9 out of 10 adults Both children and adults benefit from water fluoridation. In 1945, Grand Rapids, Michigan, adjusted the fluoride content of its water supply to 1.0 ppm and thus became the first city to implement community water fluoridation. Water fluoridation at the level of 0.7 to 1.2 mg fluoride ion/L (ppm F) was introduced in the United States in the 1940s. Community water fluoridation is the most equitable and cost-effective method of delivering fluoride to all members of most communities. In this case, the concentration is the amount (by weight) of salt in water, as expressed in "parts per million" (ppm). Studies have demonstrated that people in communities with fluoridated water have 20 to 40 percent less tooth decay than those in communities without fluoridated water. Water fluoridation is the process of adjusting the amount of fluoride in the water to the 1 part per million (ppm) concentration recommended for best protection against tooth decay. No change is indicated in the optimal fluoride level (0.7 to 1.2 ppm) for water fluoridation. This paper therefore discusses the safety of dental fluoride products, primarily with respect to the risk of dental fluorosis due to chronic ingestion of these products by pre-school children. Fluoridation of community drinking water is the most equitable and cost-effective method of delivering fluoride to all members of most communities. In fact, a 2011 study carried out by the CDC shows that the rate of decayed teeth was 32% higher among children residing in non-fluoridated areas compared to those in fluoridated communities.. Studies show that fluoridated water helps reduce tooth decay by a rate of 29% among children aged 4 to 17. By 2008, more than 72 percent of the U.S. population served by public water systems had access to fluoridated water . Fluoride’s benefits were discovered early in the twentieth century. If water has a concentration of 10,000 ppm of dissolved salts, then one percent of the weight of the water comes from dissolved salts. Fluoride is inexpensive.