The history of orthodontics has been intimately linked with the history of dentistry for more than 2000 years. Dentistry had its origins as a part of medicine.
Addressing an envelope to a post office box address is just like addressing envelopes to any other type of address. Of course, before you can address the envelope, you need the name of the recipient, the post office box number and the city, state and ZIP code.
All Military Post Offices (MPOs) have restrictions on items that can be sent using the APO/FPO/DPO system. While there are several rules of thumb that can be referred to, individual APO/FPO/DPO zip codes have restrictions that are specific to the overseas location they serve.