Traveler Oral Irrigator Waterpik WP-300 (with Necessaire travel) Ideal for travel. Includes travel case with compartment for nozzles. 50% smaller than previous desktop models. Includes an AC adapter. Automatic voltage selection. Oral irrigation is the direct application of a pulsating jet of water or other solution, which helps to eliminate bacteria deposited on the surface of the teeth, the gingival margin, in the interproximal spaces and places of difficult access. The Waterpik ® oral irrigators provide an improvement in gingival health and is clinically proven to manual brushing in combination achieved an efficiency up to 93% higher in the gingival health improvement compared to using only manual brushing.