How long does it take to see results from mouth taping?

Most people notice the immediate effects within 1-3 nights: less dry mouth, reduced snoring (if mouth-breathing was the cause), and feeling more rested in the morning. The wearable-tracked metrics (deep sleep, HRV, resting heart rate) typically take 1-2 weeks of consistent use to show measurable trends, since night-to-night variation is normal. In our sleep study, we use a 4-night crossover design specifically because individual nights can vary — the pattern across multiple nights is what matters. Give it at least a week before drawing conclusions.