Nasal breathing is ideal because it filters, warms, and humidifies the air, helping your body function properly. Breathing through your nose also helps you relax and reduce stress. In contrast, mouth breathing can lead to problems like poor oxygen levels, respiratory infections, dry mouth, bad breath, tooth decay, and disrupted sleep. It’s also associated with issues like asthma, allergies, and behavioral problems in children. Therefore, it’s important to breathe through your nose as much as possible.