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.
Now, I happen to have a PO box, (Itâs 1630 but donât you dare sending me lots of junk mail!) in the Post office closest to my own address, but the zip code of my mail box is different from the one where I live. For Post Office Boxes, the general (but not invariable) rule is that each box has its own ZIP+4 code.