For me, bc I do the 7 layers of hydrating toners (7 skin method), I prefer to do treatment before toner. Idk, I just feel like it’ll be more effective when there’s not multiple layers of products already on my skin before I use it. Plus I hate the smell so it helps get rid of it. Everything else is mostly the same except I apply essence, ampoule, and serum all at once (haha, 2 drops of essence, 4 drops of ampoule, pea sise of serum on my face and then I massage it in using a facial massaging technique. Helps me more bc I find that applying each product individually makes my face feel too tacky)