Reviv is a soft, medical-grade silicone mouthguard engineered to be worn overnight to support jaw alignment and facial posture. It aims to reduce nighttime teeth clenching, maintain the natural *Curve of Spee*, and promote improved jawline sharpness and facial symmetry over time ([eng-reviv.com][1]). User reviews consistently rate it around 4.8–4.9 out of 5, calling out noticeable ... https://www.eng-reviv.com/