I had a problem just finding a design to make a tooth fairy pocket. Will be interesting to see what comes up here.

Have never seen a dentist alphabet, well dentist designs. thread sketches has cute ones

http://www.threadsketches.net/toothfully.html

fontsgalore is probably the site you're thinking of. However, I went over there & didn't find anything like a dentist font.

Sorry, I don't know of an alpha either but this link has teeth and other designs that you could use with a plain design.

Don't think I've ever seen one, but you could embellish a plain alphabet with a tooth, and with other medical related designs, or with healthy vegetables (carrot, celery, etc) so that (s)he might remind (her) his patients of the merits of eating healthy foods. Recently a small carrot was placed in DBC.
*4u!
Hugs,
Jacqueline

Out of the hundreds of Fonts/Alphabets I have not one about dental or teeth. But I looked in my dental folder and found several from AnntheGran, FreeEmbroidery.com and BuzzTools. OregonPatchworks may also have some.
http://www.buzztools.com/
http://www.annthegran.com/
http://www.embroiderydesigns.com/
Hope this helps

There are many fonts for free at this site: dafont.com Perhaps you could add the teeth.....

Here is a free tooth alphabet download if you can upload it into your software.

only the name Fill and floss....

only the name Fill and floss....