Tooth
Teeth
noun
The kanji and the word are exactly the same. That means they share meanings as well.
The reading that you learned with the kanji is the same as this one. HA! Take that, kanji.
赤ちゃんに歯が生えてきました。
The baby's teeth are growing
タバコのせいで私の父の歯は黄色くなってしまった。
My father's teeth turned yellow due to smoking cigarettes.
電動歯ブラシを買うことを考えているんだが、どれも値段が高いんだよね。
I’m thinking about buying one of those electric toothbrushes, but they’re so expensive.