I am having trouble thinking of a professor to ask for a letter of recommendation as I did not speak to any of them personally during my time in the class. I already am thinking of asking my professor for my introductory biology class since she became my research supervisor as well. The only other professor I can think of is also a co-instructor of the same class under who I became a TA. So my question is, it would not be a good idea having my two letter of recommendations be from the same course right? in which case I was thinking of my physics professor whom I got an A in both physics 1 and 2 with, is this ok even though physics is not really dental related? Thanks.