There is no scientific evidence to support the claim that dry brushing can tighten skin. In fact, there is no medical evidence to support any of the claims made about dry brushing. Dry brushing is a popular beauty treatment that is said to improve the appearance of the skin by exfoliating dead skin cells and stimulating blood circulation. It is also claimed to improve the appearance of cellulite, reduce wrinkles and tighten the skin. However, there is no scientific evidence to support any of these claims. In fact, dry brushing can actually damage the skin. Dry brushing can cause the skin to become irritated, dry and inflamed. It can also lead to the development of micro-tears in the skin, which can increase the risk of infection. If you are considering dry brushing as a way to improve the appearance of your skin, you should speak to a dermatologist or other skin care professional first.