Curious if Reviv Mouthguard is a scam or legit product for enhancing your jawline? This review breaks down what you need to know. Reviv Mouthguard is marketed as a jawline trainer designed to help shape and tone the jaw muscles when used consistently. Many users share positive feedback, saying the mouthguard is comfortable to wear and contributes to a more defined jawline over time, e... https://www.eng-revive.com