This is the million dollars question. If you ask 3 different dental practitioners, you might get 4 different answers. From our experience, a good magnification to start with would be 3.0X-5.0X in Ergo loupes (2.5X-4.5X in conventional loupes). Other criteria to consider when choosing your loupes would be: How many teeth do you want to see (the higher the magnification is, the smaller would your field of view be hence you'll see less teeth)? How much of your practice consists of endo, surgical or aesthetics? We found that most aesthetic dentistry practitioners prefer to see a wider part of the arch, while endo and surgical prefer to see more minute details while compromising on the field of view. Please remember that there's no one-size-fits-all solution here. Give us a call and we would be happy to give you further guidance.