It doesn't mean that you can't breathe through your mouth. In some special cases, you need to breathe through your mouth, and the general teacher will prompt you.

In the practice of mobile yoga, many students are out of breath because of cardiopulmonary problems, and the flow and breathing of asana can not be well coordinated. Breathing through the mouth can achieve the effect of smooth ventilation. Besides, when your nose is blocked, you must breathe through your mouth.

But generally speaking, practicing breathing is carried out with the nose, and the reasons can be summarized as follows:

First, breathing through the mouth can cause dry throat and tracheal allergy, especially for people with sensitive respiratory system, so we suggest breathing only through the nose. The nasal cilia in the nose can filter out impurities in the air.

Secondly, the nasal passage is located in the middle of the face, close to the eyebrows and eyes, so when we breathe through the nose, the facial muscles are easier to relax. After the facial muscles are relaxed, our thinking is easier to slow down and our hearts will be calmer, so that we can really relax physically and mentally, which is more conducive to complete practice.