“Would you believe me if I told you that mouth taping can change the shape and structure of face?” a TikToker asked her audience, showing the before and after pictures of her now-chiselled jawline.Another creator promises we’ll “stop waking up in the middle of the night” if we use the trick (which simply involves placing sticky tape over your lips so you can’t open your mouth as you sleep). “If you snore? Mouth tape. Grind your teeth? Mouth tape. Clench your jaw? Mouth tape!” yet another creator started her video. The TikTok trend has blown up on the app, with countless viral videos listed under the #mouthtaping hashtag. Influencers claim a cheap, simple strip of sticky tape can transform your face, improve your sleep, and even prevent snoring.So, we spoke to Dr Chelsea Perry, owner of