Can't help with a good one but can tell you about a bad one to avoid!
Fiorentini @ 634 Belgrano. I only went there for a clean and I swear he's removed all the enamel from my teeth - he was brutal...and expensive.
Can anybody recommend a really good (OSDE) dentist in Caballito? I'm looking through the OSDE book, but with one bad experience behind me I really want to go to someone who knows what they are doing! Otherwise I might just travel to see Dr. Schmid, recommended upthead. TIA!!