I change mine like underware, I dont even finish bottles and new ones are there, same with shower gels I have actually got several unused shower gels stacked in my cupboard lol I liked one so much I bought more than one then got fed up with it by the time I finished first one. I like my smelly shower stuff and shampoos. At the mo its
herbal essence tossle me softly and it smells like lilic, makes my hair soft and shiney even if i dont get to tossel.