Using too much of any hair product can lead to problems, and dry shampoo is no exception. When overusing products in your hair, a buildup of product occurs. Plus, when you are limiting the number of times you wash your hair, the product lingers, exacerbating the buildup.
Since dry shampoo is primarily used in place of washing your hair, you should be especially careful not to overuse this product.
According to Healthline, a buildup of dry shampoo can mean trouble for your hair follicles: "An accumulation of styling products can make your scalp itch. It’s possible the buildup could also lead to folliculitis. This is a bacterial or fungal infection in the hair follicle."
However, this does not mean you have to stop using dry shampoo entirely. Instead, try your best not to rely on it too heavily.
All dry shampoos are not created the same, so also focus on picking one that works for your hair; for example, Healthline recommends a powder as opposed to a spray.
The article explains how aerosol cans of dry shampoo can weaken your hair and lead to damage: "Aerosol hair care products often contain alcohols, which can be drying for your hair. When your hair is dry, the individual fibers can crack and snag on each other when you comb or style your hair, leading to breakage."