How many pairs of teeth do traditional braces need?

Retainer is a follow-up treatment and a part of corrective treatment. If you bring upper braces, you can only make one, but to restore occlusion, you have to bring the next one. Besides, I don't know what your mouth is like, so it's hard to draw a conclusion. In that case, the retainer he made for you should be half-sized. As for the price, it doesn't depend on doing the last one and doing the next one. As long as you receive orthodontic repair, it is the same price.