Basically it's an electronic gadget that 'flosses' your teeth with water jets. It cleans even below the gum line which ordinary flossing can't reach.
But it isn't cheap.
I haven't bought one yet. I just blast my teeth with a water rinse for a couple of minutes 3-4 times a day and always after eating. Probably not as good as a "Water Pik" but definitely cleans-between teeth.
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