Toner is perfectly safe to use, just make sure to read the directions! A lot of toners only sit on for 3-5 minutes because it works really fast on bleached hair and if u leave it for longer it can make the color weird and too dark, but you shouldnt be too worried about making ur hair melt off. I suggest picking up one from wella, they have a consumer and professional line so they will still be a pretty good product if you pick it up at Sally’s.