The purpose of Tummo Breathing is to purify the mind and gain realizations for meditation. Tummo means "Inner Fire" because the practice involves visualizing an inner at the central channel.
The best way to stop mouth breathing is to increase awareness and practice breathwork. The correct way to breathe is through your nose with the tongue resting on the roof of the mouth.
Somatic Breathwork Training helps you reduce anxiety, release trauma, and regulate your nervous system.