Bonding 7s when using TADs

During en masse retraction, sometimes TADs are used to enhance anchorage. But in these cases is it good or bad to bond the second molars? To share this video use this link:    • Bonding 7s when using TADs   For other videos in Advances Orthodontics: Which bracket prescription is better, MBT, Roth or a Hybrid?    • Which bracket prescription is better, MBT,...   Why only 2 ceramic brackets?    • Why only 2 ceramic brackets?