Product Description Level 1 (30lb): Beginner. The beginner-level jaw trainer fills the right amount of resistance to start strengthening and slimming your jaw and chin. Level 2 (40lb): Intermediate. Upgrading to the intermediate level can help bring out the striations (muscle definition) in your jaw, reduce any remaining excess skin and fat under your chin, and add serious strength to your bite. Level 3 (50lb): Advanced. Upgrading to the advanced level, further train the muscles of your face and neck, reshape your face, strengthen your jawline, and tighten your skin, resulting in a more youthful appearance. Function 1.Jaw trainer can reshape your face, strengthen the lines of your face and neck, resulting in a more youthful appearance. 2.This trainer is by eliminating fat deposits around the jaw and neck to reduce double chin, chisel the jawline, promotes tightening of facial tone and chin lift. 3.This shaper reduces suction by chewing, it is a healthier and more effective way to lose weight. 4.Safety of Jaw Trainer for Women Men: Made of food-grade silicone, feel free to use. 5.Jaw Training Anytime and Anywhere: Hands-free training, workout at the gym, home, office, etc. (zhongchengdaye)