Question

why a person should not breath through mouth​

Answer 1

Explanation:

There is some thought that mouth-breathers may not be getting all the oxygen they need, which can lead to fatigue and,in some situations may cause stress to the heart and lungs. In terms of dental health, breathing through the mouth can dry the oral cavity and lead to bad breath, gum disease and tooth decay.Thats why mouth breathing may be hazardous for health.

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Answer 2

when you breathe through mouth a lot of dust particles,germs or pathogenic substances present in air may enter your body so that you may have prone to become ill or affected by diseases.