A lot of people think that toner (also known as astringent) is a necessary component of the skin cleansing process. In fact, this extra skin care step is only recommended for people with especially oily skin. The purpose of toner is to lower the skin's pH and eradicate any dirt and oil that regular cleansing didn't catch. For the vast majority of people, however, certain alcohols in toners can dry the skin out too much, which is why only people with severely oily skin should bother with this treatment -- and just once a week or so. An alcohol-based astringent with salicylic acid is best for people with oily skin. Nonalcoholic toners are available, although they're not as effective as those containing alcohol [source: Todorov].