Here's the deal.... We as dentists, carry malpractice insurance for a reason. If I, as an orthodontist, make a patient of mine a "custom mouthguard" and that said mouthguard is worn by the patient and the patient occludes funny on it and develops symptoms of TMD, etc and decides that I am the one who "made" the mouthguard and wants to sue for damages, they are entitled to do so. If the court decides that I, as the dentist who made the mouthguard am responsible for their pain and suffering, I could very likely lose in court and be sued... plain and simple! So, if a person with no license is making "custom mouthguards," even without ever touching the patient, taking impressions, etc, they are responsible for seeing that the mouthguard fits correctly, occludes correctly and will not cause harm. This person is then prescribing an appliance without a license that could be causing harm, both legal issues. Even though it may not be spelled out on paper, this is how it is. DON'T DO IT! Not worth it!