根据 Fact 4 中的" we hear our own voice through our bones(骨头) in ears"可知答案为 D。 24.A 【解析】 细节理解题。 题干表示"关于本文,下列哪一个读者 的评论是正确的",根据 Fact 2 中的" That's why most of our toothpaste(牙膏) has fluoride in it"可知,A 项"我现在明白为什么 大多数...
Fluoride, particularly sodium fluoride, is a key component in toothpaste and mouthwash formulations. It makes teeth more resistant to acids produced by plaque bacteria and reduces the risk of tooth decay. This ingredient also helps to reduce the risk of cavities. Some toothpaste brands made for...
Today there are all kinds of toothpastes. Toothpastes come in different colors and flavors. When you choose your toothpaste, make sure it has fluoride. Fluoride makes your teeth strong. Use floss Sometimes your teeth need deeper cleaning than brushing. That is when floss is helpful. You pull...
What is Natural Toothpaste? What is a Toothpaste Dispenser? Discussion Comments BeautyAnswered, in your inbox Our latest articles, guides, and more, delivered daily. Categories Beauty Fashion Hygiene Hair Cosmetic Vintage Get Around About Contact ...
First introduced into toothpaste formulas in 1914, fluoride is arguably the most valuable component in toothpaste. But it was not until the 1950's that formulations were developed in which the fluoride was available to react with tooth enamel. Marketing of the first effective fluoride toothpaste (...
According to CBS News, the American Academy of Pediatrics hasquestionedthe validity of the report, saying other reviews have come to different conclusions about fluoride's risks and benefits. The AAP is among the expert groups that continue to recommend using fluoride toothpaste, in combination with...
Sodium fluoride is a common compound used in toothpaste. 4 Fluorine Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. Fluoride Fluoride () is an inorganic, monatomic...
What is an example of concentration in everyday life? The concentration of fluoride in toothpaste affects its effectiveness in preventing cavities. 9 Why is concentration important in chemistry? It determines how substances interact and react with each other. 6 What unit is strength measured in? St...
The small amount of toothpaste that stays in your child's mouth can help prevent cavities. From 3 to 6 years, your child needs to have his or her teeth brushed with fluoride toothpaste 2 times each day. You should also floss your child's teeth 1 time each day. Brush for at least 2...
“Over time, dental decay can be expected to increase if water fluoridation in a community is discontinued, even if topical products such as fluoride toothpaste and fluoride rinses are widely used.” InFluoride debate: Ken Perrott’s closing response to Paul Connett?I discussed one of the ADA...