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| Comparison of bones and teeth ： ウィキペディア英語版 |
Comparison of bones and teeth
The human bones and teeth are one of the most similar yet different structures within our body. They are both made of living and non-living materials, and both are replaced at some point. However, they have different specialized cells, compositions of calcium and phosphorus, different functions, and different kinds of cells.
== Teeth ==
The hardest substance in the human body is the teeth. It is generally assumed that teeth are used only for eating, however it has a bigger impact than what is the notion in this regard (e.g. speech). The anatomy of the teeth is not simple as one may presume, but rather complex. Our teeth are unique as they can be used for both biting and tearing, which is good for tearing food, and grinding and crushing, which are beneficial for chewing and grinding foods.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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