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in the mouth
within the mouth
The sugars in these foods combine with the bacteria normally in the mouth to form acids.
Genetic material may come from many sources such as hair, blood or even cells from inside one's mouth.

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Open the tool →口腔内 (kǒu qiāng nèi) means “intraoral, in the mouth, within the mouth”.
口腔内 is pronounced kǒu qiāng nèi in Mandarin Chinese.
“intraoral” is 口腔内 (kǒu qiāng nèi) in Chinese.
This page has 2 example sentences using 口腔内, each with pinyin and an English translation.