Malocclusions depend on many factors among which are: dental agenesis, traumas, tooth loss, use of inaccurate prosthesis from a functional point of view, especially if mobile-bearing ones. The combination of these factors causes an asymmetric function of the lower jaw muscles and consequently disorders of the temporomandibular joint (TMJ). In the long term, the system can deteriorate and develop complex symptomatologies with muscle pain, cracking joints and mouth blocks when opening and closing. As soon as these symptoms appear, the specialist must intervene with the use of an occlusal appliance called bite. The bite represents the first device to solve malocclusions and TMJ disorders. It will then be necessary to proceed with an orthodontic or prosthetic treatment in order to re-establish a balanced situation. Bites can be of different types, depending on their shape, position and therapeutic indication. They can be employed at neuromuscular level to modify irregular dental contacts, or in lower jaw bad habits to relax the musculature or get the patient used to assume a correct posture.