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.
California will not let you use a PO Box for a business address, so that option was out. I looked into virtual offices but found them expensive and unnecessary for my business. I started my search by using Google to find all the mailbox providing businesses within 5 miles of my house. A UPS store was close but was more expensive than other options. I ended up with a local mailbox provider within 2 miles of my house.