Allergies → mouth breathing → cavities. Mewing helps.
Allergies that trigger nocturnal mouth breathing can dry out saliva and accelerate cavity formation, even with rigorous oral hygiene.
• Spring pollen and pet allergies force nasal blockage
• Mouth breathing at night cuts saliva flow
• Dry mouth eliminates the mouth's natural cavity defense
• Myofunctional therapy (mewing) retrains oral posture and swallowing
If you wake with dry mouth, drool while sleeping, or snore, cavity risk spikes regardless of brushing discipline.