A hairbrush includes a base with a handle and an elongated end portion connected to the handle. The elongated end portion includes a plurality of slots extending inwardly from a front side surface of the elongated end portion and a cavity extending inwardly from a lateral side surface of the elongated end portion. The cavity and the slots extend in different directions and intersect one another inside of the elongated end portion of the base. The hairbrush also includes a locking bar with through holes extending in the cavity and movable between a first position and a second position inside of the cavity. The hairbrush may further include a plurality of bristle structures, insertable into the slots and the through holes of the locking bar, and selectively coupleable to the elongated end portion of the base by moving the locking bar to one of the first and second positions thereof.