I had specific names. I shadowed many different dentist, so a generic one would have confuse adcom as who I would be talking about. I chose to talk about ones I get LoRs from. It did not detract from the main theme or sounded like a testimonial, it's all about how you write it. If just replacing "generic dentist" with a name makes your PS detract from the main theme or sounds like an advertisement for that dentist, you need to rewrite that part anyway.
You can talk about other people and still make it all about you.