I have a LOR from one of the dentists I shadowed... but I know its going to be generic and not very strong. I only asked for it so it would fulfill the requirement of 3 or so of the schools I'm applying to that specifically asks for a dentist LOR. I would rather use the one by my research advisor which would be much better. Is it important to include this as one of the 4... or should I just send it individually to the 3 schools that require it?