A toner can help remove excess dirt, oil, and dead skin cells that are not always removed when you wash your face, which is why it is best to use a toner after facewashing. Toners are more helpful for people with oily skin and clogged pores; they may be not as useful for people with dry skin, unless you buy a toner with more hydrating properties. Toners can shrink pores by absorbing excess oils. After washing your face, a toner can also restore your skins natural pH balance. This can help prevent acne because it makes your skin less vulnerable to bacteria. Since toners can also help tighten pores, it also makes it harder for environmental pollutants to penetrate your skin. It is best to avoid an alcohol-based toner as this is harsh on the skin.