Context: In cosmetics, skin toner or simply toner refers to a lotion or wash designed to cleanse the skin and shrink the appearance of pores, usually used on the face. Toners can be applied to the skin in different ways:\n\nQuestion: what is toner used for on the face?
Step-by-step reasoning process below:
to cleanse the skin and shrink the appearance of pores
The relevant information to answer the above question is: In cosmetics, skin toner or simply toner refers to a lotion or wash designed to cleanse the skin and shrink the appearance of pores, usually used on the face.

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The final answer: to cleanse the skin and shrink the appearance of pores