There's been a lot of debate recently about the efficacy of flossing your teeth -- that is, does it actually improve anybody's oral health? Some studies have shown that people who floss don't seem to have healthier mouths than those who merely brush their teeth. So whether you need a Waterpik Water Flosser WP-670 depends on several variables. One is whether the anti-flossing studies are accurate. (There have been other studies that disagree.) The other is whether a water flosser, with its ability to slip water into places where a strand of floss isn't likely to go, can do a better job than floss alone.
Whether you believe that flossing is important or just feel that it's better not to take any chances with those precious enamel-covered organs that chew your food for you, the WP-670 is inarguably easier to use than standard floss and as long as you're going to floss anyway, you should really consider trying one.
To begin with, it only requires one minute per day for it to do whatever good it's going to do, so it's not a significant burden to add water flossing to your regular toothbrushing routine (which you may also be doing with the aid of a water-based device from Waterpik). It has ten different water-pressure settings, so that you can set it according to the sensitivity of your gums, and can hold up to 90 seconds worth of water, presumably so that you'll have enough for the higher pressure settings. It's attractive and you can buy it in four different colors.
I can't believe its so much easier and thorough than flossing. It also massages your gums.
This thing has a lot of power, but is basically useless. The water comes out in a continuous stream, even in massage mode.
I've only been using it about two months. Didn't tell the hygienist I was using it, and she notice less tarter build up.