While it's true that some toners can be drying to the hair, it's not necessarily true of all toners. It really depends on the ingredients that are in the product. Some toners contain alcohol, which can be drying to the hair, but others may contain hydrating ingredients like glycerin or aloe vera. So, if you're concerned about whether a particular toner will dry out your hair, it's best to check the ingredient list before you buy it.