Candy of my eye,
AADSAS will not charge you 'additional' fee to photocopy and send your letters of recommendation to dental schools! This service is included in the fee that you are already paying when applying to dental schools with AADSAS. As far as number of letters to send in, AADSAS will photocopy as many as you send in and send them to the dental schools. Remember, dental schools usually requires 3 letters of rec. (2 science profs. and 1 non-science profs. generally speaking).
Also, for those of you applying for 2003, when you ask for your letters of rec. from professors, there are a number of ways that you can get the letters to AADSAS.
1) Ask your professor to send it in when (s)he is done with it
2) Ask your professor to give it to you in a SEALED and SIGNED school envelope so you can send it in with all your other stuff (Official Transcripts, Registration sheet, etc.)
I prefer option two for couple of reasons. First, when you ask the professors to hand you the letter once (s)he is done with it, they tend to write the letter sooner and usually they will also ask you "When do you needed by?" Secondly, if you send it in to AADSAS yourself instead of professors themselves doing it, you'll know that when you sent it in and when AADSAS should receive it. You'll be better informed on your application status and can avoid all them phone calls to the professors and AADSAS.
Just something to think about.