Piezas, Set de entrenamiento de mandíbula, Entrenador facial de mandíbula, Fortalecedor muscular de mandíbula de silicona, Dispositivo de fitness facial para la línea de la mandíbula y la papada, Vers

Package Contents: 8 jaw muscle trainers, including 2 black, 2 white, and 2 gray (upgraded version). Medical-grade silicone material: soft, BPA-free, and hypoallergenic. Safe for daily use and non-irritating to the skin. Adjustable resistance: convenient for gradual training. Suitable for beginners and advanced users. Dual-function design: trains both jaw and facial muscles simultaneously. Improves jawline and reduces double chin. Ergonomic design: comfortably fits the mouth. Suitable for jaw muscle training. Lightweight and portable. Scientific principle: helps relieve temporomandibular joint disorder and jaw pain.