For all you cavity prone sweet eating mutherfuckers who don't like to floss, get this:
Amazon.com: Philips Sonicare HX8331/11 Airfloss Pro Rechargeable Electric Flosser: Beauty
Used it for 2 years, it's great, yea seems expensive, really just fill it up with water or listerine(try just water, listerine might leave a gunky buildup), it's super easy. It's a lot better than the waterpiks, i think the whole tube and everything of the waterpiks and how it's "always on" and is pretty big footprint wise, tends to be annoying, also this is portable so you can travel with it.
Usually, i wake up, take my soniccare toothbrush (yea i use the sonic toothbrush too) brush while setting up coffee maker, then take the floss, hell, i floss twice a day cuz it's so easy now.
I still floss with string once a week, mainly because the dentist said my teeth are great, except the very back teeth, cuz there's no inbetween teeth there i don't get to floss there much, so he said just take a string of floss once a week to the back teeth and scrap up and down, i can try just using the sonic flosser there, but he said it's more effective this way, who am i to argue. He said his worst clients(meaning no cavities) are the ones with the sonic care toothbrush and flosser.