Answers pretty much have covered it, but I’ll add that mouth breathing during your developmental years can even result to bad craniofacial-dental growth.
[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7944632/](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7944632/)
[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4295456/](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4295456/)
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