Does Mouth Tape Work? What the Evidence Actually Says

What mouth tape actually does

Mouth tape is a small adhesive strip worn across the lips during sleep. Its only job is to keep your mouth gently closed so air flows through your nose instead.

It does not open a blocked nose, reposition the jaw, or treat sleep apnoea. It simply removes the option to mouth-breathe, which for many people is enough to reduce snoring and dry mouth.

What the research says

• A 2015 study in Otolaryngology–Head and Neck Surgery found mouth taping reduced snoring and improved nasal breathing in mouth-breathers with mild sleep-disordered breathing.
• A 2022 systematic review noted mouth taping can improve snoring indices but stressed it is not a substitute for CPAP or professional OSA treatment.
• Dentists and myofunctional therapists commonly use mouth tape as part of nasal-breathing retraining, especially alongside tongue-posture exercises.

Who it helps most

• People who wake with a dry mouth or sore throat.
• Partners of snorers where the snorer sleeps with an open mouth.
• Anyone trying to build a nasal-breathing habit during sleep.
• Athletes recovering from hard training who mouth-breathe at night.

Who it does not help

• People whose snoring comes from throat-level airway collapse (sleep apnoea).
• Anyone with a fully blocked nose from a cold, severe allergy or structural issue.
• People who cannot remove the tape themselves.

How long until you notice a difference

• Night 1–3: awareness of mouth position improves; dry mouth often drops immediately.
• Week 2: snoring is usually noticeably quieter if mouth-breathing was the cause.
• Week 3–4: nasal-only breathing starts to feel automatic for many users.