Mouth tape might stop your mouth breathing but it doesn't stop the root cause... Your bad oral posture. Low tongue placement = reduced airway Your tongue is critical to establishing proper oral posture and breathing habits. When you seal the tongue to the top of the mouth it opens airways, reaffirms proper jaw alignment, and maximizes your nasal breathing. This is why we created our mouthpieces with a front wall to eliminate mouth breathing and a tongue shelf that elevates the tongue into proper position to establish healthy posture and maximize your airway. Sure, you can just hold your tongue there and you should. BUT habits take time to replace. ESPECIALLY during hard workouts where you are focusing on technique, getting gassed, and etc ....not to mention sleep. Think of this as an accountability device and habit corrector. Get more out of your breathing during workouts and even your sleep.