Scientists say the diet of prehistoric humans probably required more chewing teeth.
科学家们表示，史前人类的饮食可能需要更多咀嚼齿。
Sealants are protective coatings placed over the tops of chewing teeth - molars and premolars.
封闭剂在是牙齿咀嚼面上覆盖一层保护材料——在磨牙或者前磨牙。
Scientists say the diet of prehistoric humans probably required more chewing teeth. Life was probably a little rougher on the teeth back then, too. So it was good to have extras.
科学家说史前人类的饮食习惯需要有更多的咀嚼的牙齿，没有口腔后部的磨牙生活也会变得十分艰辛，所以会有额外的牙齿长出来。
Chewing gum, once bought primarily by adolescent boys, is now featured in commercials as a breath freshener and teeth cleanser for use after a meal.
曾经主要由青少年购买的口香糖，现在在广告中被用作饭后的口气清新剂和牙齿清洁剂。
"He takes a handful of ugali and puts it between his teeth." we're trying to show them, "he goes on, chewing," that they can choose a different way.
他抓起一把玉米粉，放进牙齿之间，“我们试着向她们展示，”他一边说一遍嚼着，“她们可以选择一种不同的生活方式。”
Remember to brush the inside and chewing surfaces of your teeth, as well as your tongue.
切记牙齿的内侧和咬合面都要刷到，舌苔也要刷哦。
If you chew gum, stop — the habitual chewing action can make it more likely you'll grind your teeth at night.
如果你嚼口香糖——停下来——习惯性的咀嚼动作会让你更可能在夜间磨牙。
Brush your teeth at least twice a day, floss at least once a day, see your dentist regularly, and avoid smoking or chewing tobacco.
至少两天要刷一次牙，每天用一次牙线，定期拜访牙医，并且避免抽烟和咀嚼烟草。
The chewing surfaces of back teeth are rough and uneven because they have small pits and grooves.
后磨牙的咀嚼面是粗糙和不平的，因为它们有小的凹陷和沟槽。
Mandel explains teeth grinding, which many women do, as "chewing over the day's stressors."
Mandel解释道，许多女性常常磨牙，就像“要把一天的压力嚼碎一样”。
Jaw muscles can provide about 200 pounds of force to bring the back teeth together for chewing.
颚肌可提供约200磅(90.72公斤)的力量，以便臼齿合拢咀嚼。
While primary teeth will at one stage be replaced by the permanent teeth, they are very important for several reasons - including chewing and speech.
虽然乳牙会在某一阶段全部更换为恒牙，他们是非常重要的几个原因，包括槟榔、讲话。
Sealants are thin, plastic coatings painted on the chewing surfaces of the back teeth.
牙齿保护胶是一种薄的塑料涂层，涂在磨牙的咀嚼面上。
Feel gratitude for your teeth and all that they allow you to do - chewing, smiling, speaking.
感激牙齿以及它们能让你做的事——咀嚼、微笑和讲话。
Compared to us, they had larger teeth and stronger chewing muscles, a stouter skull with a smaller brain.
和我们相比，他们拥有更大的牙齿和更为强壮的咀嚼肌，同时他们的头骨也更强壮一些但脑部较小。
Once you've done all the sides, you can gently use that old back-and-forth motion to clean the top chewing surfaces of your teeth.
一旦刷完了内外两面，轻轻地使用旧式前后移动的方式来清洁牙齿的咀嚼面。
Misalignment of teeth between the upper and lower jaws can grind down the teeth and cause problems in chewing. Elsewhere, it is a cosmetic problem.
下颚间的牙齿咬合不正会磨损牙齿并造成咀嚼问题，此外，也会造成外表美观的问题。
Brush all surfaces of the teeth, including the outer, inner and chewing surfaces as well as the hard-to-reach back teeth and areas around fillings, crowns or other restorations.
牙齿每一面都要清洁到，包括牙齿外面、里面和咀嚼面，别忘了刷难以够到的后槽牙和包括填充物和牙冠在内的修复牙体周围。
When the fillings are placed in the teeth or removed, or during chewing, mercury vapor is released, according to the FDA.
FDA称，合金被用于修补牙齿后，当咀嚼时，会释放汞蒸气。
It is often stated that when chewing, the teeth are separated by the bolus of food, and so the manner in which they occlude is not important.
通常认为，咀嚼时牙齿被食团分开，从而咬合的方式并不重要。
We expect chewing gum to be hewy crackers and potato chips to be crisp and steak to be compressible and shearable between the teeth .
我们希望口香糖非常耐嚼，饼干或土豆条又酥又脆，牛排咬起来要松软易断。
The computer receives a command when the user clenches his or her teeth for about one second — which differentiates the action from other activities such as chewing gum and talking.
当人们咬紧牙约一秒钟时，微型计算机就能接收到一个指令。而这里所说的咬紧牙与嚼口香糖和说话等活动是不同的。
The computer receives a command when the user clenches his or her teeth for about one second — which differentiates the action from other activities such as chewing gum and talking.
当人们咬紧牙约一秒钟时，微型计算机就能接收到一个指令。而这里所说的咬紧牙与嚼口香糖和说话等活动是不同的。
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