I haven't heard much about Campus Dentist. They are convenient, obviously.. but if I were getting anything done requiring 'teeth shaping' sounds like something I'd want to trust to professionals with great reviews.
Between the two, I'd go with Ancaster. From the review posted on MacInsiders
here, the student that went to Campus Dentist says that they were charged upfront, while at the Ancaster location they heard that they charged the insurance first so it wasn't all upfront.
You'd have to call to confirm.