Actually, the instruments used in the doctors office are usually the EXACT SAME ones that are used in the mall kiosks. Ask your dr, chances are good they are an Inverness system (or one of the other big brands) and they are cleaned the exact same way. I used to pierce ears for a living and once had a conversation with my daughter's pediatrician about it and she even said I am probably much better at it than she is since I do it about 50 times a week whereas she does it once or twice a week. My company also required training sessions every 3 months. How often do you think your pediatrician has a "refresher course"?? Also, often the nurse marks the ears and does not worry as much about them being even as we would in the store.
Yes, infections are out there, but the dr's office isn't loaded with germs and infection??????
I am not trying to debate this, everyone needs to do what they feel is best for their child, just wanted to point out the flip side of having a dr. do it.