Tex. Occ. Code § 605.351

A person or an employee, agent, or representative of the person may not use in connection with the person's name or business activities the terms or a combination of the terms or letters described in Section 605.301(2), indicate orally or in writing, directly or by implication, that an orthotic or prosthetic service is provided or supplied, or extend or provide orthotic or prosthetic services unless the person is an orthotist or prosthetist or an assistant to an orthotist or prosthetist licensed under this chapter.