If your jaw isn't properly positioned, the exercise itself could be damaging to your jaw joint. Repeated applications of high levels of force could displace, damage, or wear the bone or cushioning cartilage in the jaw joints.

Do jawline exercises actually work?

These exercises can do more than give your face a more defined or a younger look—they can also prevent pain in the neck, head, and jaw. Studies have shown that jawline exercises may help reduce the effects of temporomandibular disorders, or chronic pain in the jaw muscles, bones, and nerves.

Is Jawzrsize bad for your jaw?

Parafunctional activities, like chewing gum or using a Jawzrsize, increase the strain on the face and jaw. These should actually be avoided, Sedghizadeh told Healthline, because they have the potential to lead to the development of jaw problems.