Sorry, but HPV has a good chance of infecting you if you don't use protection. Technically, if he has been treated for HPV, the virus may have been killed but it's the potentially infected area that don't have warts that are also a concern. I've read that getting tham orally is possible, but highly unlikely.
Here are some medical links:
[url="http://www.emedicine.com/derm/topic454.htm"]http://www.emedicine.com/derm/topic454.htm[/url] [url="http://www.emedicine.com/emerg/topic640.htm"]http://www.emedicine.com/emerg/topic640.htm[/url]