A toothbrush comprising a body of bristles and at least two separate compartments, wherein a first compartment comprises a plaque indicating substance, and a second compartment comprises a tooth cleaning substance, said body of bristles defining a contact surface to which substances can be applied, the toothbrush further comprising discharging means to apply the plaque indicating substance and the tooth cleaning substance to the toothbrush, such that the visible surface area of the plaque indicating substance on the toothbrush is larger than the visible surface area of the tooth cleaning substance on the toothbrush.