Tex. Occ. Code § 266.203

This chapter does not prohibit a person who is subject to and complies with this chapter from using the United States mail, a railway express agency, Western Union, or a messenger or common or contract carrier to handle, accept from, or transport or deliver to a dentist or dental laboratory an item in any form or state of completion on which a dental laboratory service will be or has been offered or ordered to be performed.