After seeing Dr. Lim's study which was presented at the NonSurgical Symposium in Australia, I would say there is absolutely no reason to wait. I have done for years a combination of fillers with Infini on the same day and have had no problems at all. I have always placed the fillers in the sub cutaneous layer or deeper with cannulas. Bellafill has a very high temperature (160C) for it to degrade and the Infini only goes to about 65-70C. I have placed Bellafill in the dermis on the same day without effects as well. Dr. Lim's study showed that even with fillers placed in the dermis, there was no effect. I have advocated in the past that dermal fillers were at risk for being degraded but Dr. Lim changed my mind.