Question

Why should we only breathe through nose

Answer 1

Because the hair present inside our nose filter the air that we breathe and avoid dust particles coming in contact with respiratory system

Answer 2

Because while breathing through our nose, thanks to the hair we have around our nostrill walls, air is purified which maintains our lungs cleaner and healthier. When we breathe through our mouth, air is not purified so dust goes in which can cause damage to our throat and lungs.

Hope it helped,

BioTeacher101