A liquid-reservoir hairbrush that is capable of evenly dispersing water-based solutions and other thin and non-viscous liquids over the user's scalp during routine hair brushing. Absorbent filler unit(s) are placed into a chamber of the hairbrush body and absorbent feed rods are placed into bores of the hairbrush bristles. The hairbrush can be provided with roller-ball or felt-tipped nozzles mounted at distal ends of the hairbrush bristles. The absorbent feed rods interconnect the absorbent filler unit(s) and the nozzles, and the liquid from the absorbent filler unit(s) is supplied to the absorbent feed rods and then to the nozzles. The chamber of the hairbrush body can be divided into multiple, hermetically isolated sections. The hairbrush body can have an optional filler inlet and can come with an optional liquid refilling unit which can hold a predetermine volume of the liquid. The hairbrush comes with a removable bristle lid to keep the bristles enclosed when the hairbrush is not in use and to help prevent the nozzles from drying out.