Before we used toothpasteMANY years ago, people didn't know how to look after their teeth. They usedcharcoal(木炭), lemon juice, ash (the stuff left over from fire) or tobacco and honey mixed together ……

's That Stuff" (http://pubs.acs.org/cen/whatstuff/stuff.html). The website explains the science behind popular products such as chewing gum (口香糖) and teeth whiteners.Now you can put all that high-school ……

's That Stuff" (http://pubs.acs.org/cen/whatstuff/stuff.html). The website explains the science behind popular products such as chewing gum (口香糖) and teeth whiteners.Now you can put all that high-school ……

Which animal has the most teeth?Snails – they have hundreds to thousands of teeth. ……

GLASBERGENThe four basic food groups are stuff that will make me fat, stuff that will make me sick, stuff that will kill me, and stuff that I'll eat anyway. ……

. However, a recent study showed that exploding stars likely created the calcium in our bones and teeth... in the universe – and our bones and teeth – came to be. As US astronomer Carl Sagan once ……

The teeth of a lobster (龙虾) are in its stomach (胃). ……

A lobster’s (龙虾的) teeth are in its stomach (胃). ……

Toads (癞蛤蟆) don’t have teeth. ……

Most frogs have teeth. Their small teeth are on the roofs5 of their mouths. So we can’t easily see them. ……

, tough battle against the cancer which eventually took his life.Instantly recognizable from his... a cigarette? First take a look at therotten(腐烂的) teeth and blacklungs(肺) smoking may give you. Horrible ……

My favorite subject is art. I like drawing people. This painting is of me. I'm brushing my teeth. I take good care of my teeth. So I have healthy (健康的) teeth. ……

Clean your sweet teeth巧克力牙膏Chocolate is bad for your teeth, but not this one. US company Theodent made chocolate flavor (口味) toothpaste. It brushes your teeth and you can even eat it. ……

thing worth remembering in tough times?McCreery: There’s always light at the end of the tunnel (隧道). Sometimes you’ve got to work through some tough times and you’ve got to work really hard. It might ……

thing worth remembering in tough times?McCreery: There’s always light at the end of the tunnel (隧道). Sometimes you’ve got to work through some tough times and you’ve got to work really hard. It might ……