I have a little insight to this as I will be applying this fall, and over winter break, prepared a few packets for planned LORs from professors. I basically included the LOR release form that contains the information you talk about (talks about waiving the letters which I reccomend you do...a confidential letter just looks better) and the formalities of the LOR process, a transcript all my undergraduate coursework, a letter formally requesting the professor for an LOR and also thanking them for taking time in the class to meet and discuss the subject (of course my letter was more detailed than this) and finally, a one page essay about myself, and at the bottom included more information to help and make ease with the letter writing process, such as my grad. date, full name, name I'd like to be reffered to in letter (Doug, not Douglas), and other important tidbits. With all this information at hand, the LOR process will be much easier for the professors I have contacted, and they will be much more enthusiastic to write the letters, with an abundant amt. of info available. Contact your letter service organization, usually located in the academic advising center of your college. They'll have lots of forms for you to fill out to complete a file, where all letters are stored until you notify them to send. Good luck!
PS: to add more about yourself, your interests, abilities, hobbies, and activities, don't fill your page about yourself with info. regarding grades and more about the class you were in with your reccomender, this should all go in that first letter that formally asks for their LOR (make this about a half page as professors are busy and hate to read long letters, especially from students). Make sure you show them your humanistic side and passion for entering dentistry...add all this in your letter about yourself.