If you haven’t yet discovered handles for your dental photography mirrors you are missing out. For many years I struggled to take mirror shots and hold the mirrors by hand. It was a combination of frustrations. I could never have enough control over the mirror to retract without having fingers in ever image. When I was first introduced to the handles I was a bit skeptical, but I would never take a mirror photograph without them today.
The handles slide into a metal slot on the back of the mirror. There is a straight handle designed for occlusal mirrors, and a bent handle that is used for the buccal retracted mirror images. I do swap them from time to time for quadrant images, but the routine diagnostic series uses them as described. I get my mirrors with handles from PhotoMed. if you already have a supply of mirrors that do not have the slot on the back for the handle they also sell a universal handle that you can use instead.