Mouth breathing occurs when a person breathes primarily through their mouth instead of their nose. This can happen for various reasons, such as nasal congestion, allergies, or anatomical issues like a deviated septum. Mouth breathing can lead to dry mouth, bad breath, and dental problems, as it reduces saliva production and alters the natural balance of bacteria in the mouth. Long-term mouth breathing can also affect facial development, particularly in children. It may lead to changes in the alignment of teeth and jaw structure, potentially resulting in orthodontic issues. Addressing the underlying causes, such as allergies or nasal obstructions, is important for promoting healthier breathing habits.