Panasonic Oral Irrigator Jet Washer Doltz EW-DJ75-W Water jet cleaning removes even the dirt that a toothbrush can't. Promotes gum health in about 3 days with "ultrasonic water jet" (*Water flow that generates ultrasonic waves through the shock waves when bubbles burst*) (*Only when using the ultrasonic nozzle*) (*Verified at water pressure level 10. Our research. Usage effects vary depending on conditions.*)