Synergy uses a combination of both hard and soft wax to ensure a comfortable and thorough waxing experience. If you are currently using a topical prescription on your face such as Retin A, Renova, Tazorac, Benzol Peroxide, or any form of AHAs such as Glycolic Acid you will need to stop and wait at least 72 hours before facial waxing can be performed. For body waxing, hair must be 1/4 inch long for best results.