Abstract: A retractable brush includes a hollow casing combined by a lower cover drilled with a bristles holes therein and an upper cover, a bristle base slidably held in the casing having a plurality of bristles formed on the base extendible outwardly from the lower cover for combining and brushing use, and a bristle extender having a push button slidably held in the upper cover which is depressed to push the brittle base downwardly in order to extend the bristles outwardly until being locked on the upper cover and upon a disengagement of the push button from the upper cover, the bristles will be retracted into the casing as restored by a restoring spring. Upon the extending of the bristles for combing or brushing operation, a water stream may also be applied through the hollow casing, the bristles holes to spray onto the hairs as being combed or brushed.