How Are Front Teeth Retracted After Premolar Extraction? (photo)

I had four first bicuspids removed for treatment recently and my orthodontist has power chains from the furthest back molars to the canines and I am also wearing elastics at night from the upper canines to the second from last lower molars. My canines are all moving back quite fast, I had them extracted November 1st and they have moved a few millimeters already. I think my ortho is waiting for my canines to fully move back. I am just wondering how they move the front four teeth back typically?

No doctor answers yet