Manual dental brush with timer (2), that can be used as a conventional manual dental brush, characterized by being formed by a main body with its head (3) and handle (1) and equipped with a timer (2) that has: - a time counting element - a warning element - an element for communication between the time counting element and the warning element - a fastening element to the main brush body The timer set (2) can be in any handle part (embedded, sticked or thread). The time counting element can be electronic-digital type and the warning element can be acustic. Different parts of the brush may be manufactured in a wide variety of materials and sizes. The head (3) can be replaceble when bristles are weared out and it is joined to the handle (1) by thread or insertion, the handle being reused with the timer included.