根据第三段最后一句“The fluoride mixes with enamel (釉质),the hard surface on teeth,to help prevent holes from forming.〞可知答案是C。答案: C相关推荐 1According to the passage,what is the function of fluoride? A. Makingthe surfaceon teeth much cleaner. B. Protecting gums from being ...
Dentists say it is important to find soft toothbrushes made especially for babies,and use them very gently. The use of fluoride(氟化物) to protect teeth is common in many parts of the world. This natural element is often added to drinking water supplies. The fluoride mixes with enamel(釉质...
The use of fluoride (氟化物) to protect teeth is common in many parts of the world. For example, it is often added to drinking water supplies. The fluoride mixes with the hard surface of teeth to help prevent holes from forming. But young children often eat some toothpaste (牙膏) when ...
Ringe JD, Meunier PJ (1995) What is the future for fluoride in the treatment of osteoporosis? Osteoporosis Int 5:71-74Ringe JD.Meunier PJ.What is the future for fluoride in the treatment of osteoporosis?Osteoporosis Int 1995;5:71Ringe JD, Meunier PJ. What is the future for fluoride in ...
Fluoride is the negative ion of the elementfluorine. The symbol for the element fluorine is F. Fluoride often is written as F-, which stands for the anion of fluorine that has a -1 electrical charge. Any compound, whether it is organic or inorganic, that contains the fluoride ion is also...
First off, it'sfluorineandfluorideand notflourineandflouride. The misspelling is common, but the "u" comes before the "o" in both.Fluorineisa chemical element. In pure form, it is a highly toxic, reactive, yellowish-green gas. The fluorine anion, F-, or any of the compounds containing...
when fluoride is added to a community's water supply, tooth decay decreases. The American Dental Association, the World Health Organization and the American Medical Association, among many other organizations, have endorsed the use of fluoride in water supplies because of its effect on tooth decay...
since then have repeatedly shown that when fluoride is added to a community's water supply, tooth decay decreases. The National Dental Forum, Dental Association of South Africa, among many other organizations, have endorsed the use of fluoride in water supplies because of its effect on tooth ...
The mineral fluoride is very important for healthy teeth. WebMD helps you know if you're getting enough for optimal dental health?
The Lewis structure of Calcium fluoride (CaF2) consists of a central atom, calcium atom (Ca), and 2 non-metallic fluorine atoms (F). CaF2 is an ionic compound, and the type of bonding is ionic bonding. The CaF2 Lewis structure is shown below: In the Lewis structure drawing of CaF2, ...