Best dental clinic in Adambakkam | Mouth Breathing vs. Nasal Breathing: Dental Consequences Breathing through the mouth might seem harmless, but over time, it can lead to serious dental issues. Mouth breathing causes dry mouth, which reduces saliva flow — your mouth’s natural defense against cavities, bad breath, and gum disease. In children, it can lead to narrow jaws, misaligned teeth, and even affect facial growth. On the other hand, nasal breathing supports proper jaw development, better oxygenation, and improved oral health. At Dr. Akkshaya Dental & Aesthetics, we assess airway-related habits and guide you with corrective strategies to protect your smile — and your health.