Hand-held oral irrigating device

An applicator for discharging a pulsating flow of a medicated treatment liquid, comprising:

• a housing having an inlet for receiving a variable rate stream of continuous flow treatment liquid and an outlet for discharge of a pulsating flow of the treatment liquid;
• a reservoir defined in said housing for containing a supply of liquid medicament;
• means in said housing operable for pumping the liquid medicament out of said reservoir at a controllable volumetric rate;
• and
• dual function means in said housing for converting the input stream of continuous flow treatment liquid to a pulsating liquid flow and for operating said pumping means for dispensing the contained medicament into the pulsating flow of treatment liquid at a volumetric rate controlled by said dual function means in accordance with the variable rate inlet stream of continuous flow treatment liquid so as to mix the medicament with the pulsating treatment liquid at a substantially constant predetermined ratio and thereby define a combined pulsating flow of medicated treatment liquid for discharge through said housing outlet.