PROTECT brackets are incredibale and smart, have many advantages as follows: 1:Lower Friction Force 2:Innovative Hidden Hook Design 3:Ultra-Slim Profile Design 4:Comfortable for the patient 5:Shorter Treatment Duration 6:Easier Unlocking and Locking 7:Unique Opening Direction 8:A distinct lable of brackets 9:Using metal injection molding technology 10:Using the latest polishing technology