SILICONE MATERIAL: Facial masseter trainer is made of good silicone material, safe and eco friendly, flexible and skin friendly, wear resistant and odorless, durable for use. COMPACT & PORTABLE: Light weight and in small size, easy to store and carry, convenient to use when watching TV or in the bathroom, perfect for home and travel use. EASY TO USE: Put jaw exerciser in your mouth, hold it with your mouth, and then use your mouth to inhale and exhale, good training effect. Can help slim your face after long term use. FACIAL SKIN TIGHTENING: Masseter trainer helps tighten and lift facial skin, easily reduce nasolabial folds, and effectively prevent skin aging and sagging, make you look younger. FACE MUSCLE TRAINING: Exercise the face, contract masseter muscles, activate facial expression muscles, and make facial lines softer and more beautiful.