Is it better to breathe through the nose or through the mouth???

Breathing through the nose is much better. The evolution of the nose occurred specifically for breathing. There are many hairs and mucus in our nostrils that filter dust particles, bacteria, etc., preventing them from reaching the lungs. In addition, during nasal breathing, the temperature of the air becomes equal to the body temperature, so the lungs do not have to face the air at the external temperature. Especially in winter when the air is cold and dry, breathing through the nose moisturizes the air by the time it reaches the lungs, thus maintaining the correct moisture ratio in the lungs...

Breathing through the mouth will dry out the mouth, and a lot of dust and dirt will go inside...