How does an astringent benefit oily skin?

An astringent benefits oily skin primarily by assisting in cleansing. Astringents are designed to tighten skin and reduce oiliness, which is particularly advantageous for individuals with oily skin types. They often contain ingredients that help to remove excess sebum and impurities, thereby keeping the pores clear and minimizing the appearance of oiliness. This cleansing action not only helps to improve the overall look of the skin by reducing shine but also can prevent the development of acne and other skin issues caused by clogged pores, which oily skin types are more susceptible to.

In contrast, the other choices do not accurately reflect the role of astringents. For instance, providing hydration is not a function of astringents; in fact, they may have a drying effect on the skin. Increasing oil production contradicts the purpose of using an astringent; rather, it aims to reduce oiliness. Lastly, altering skin sensitivity is not a characteristic associated with the beneficial effects of astringents on oily skin. Thus, focusing on their ability to assist in cleansing emphasizes their role in maintaining a balanced complexion for those with oily skin.