美国海淘    waterpik 洁碧 Cordless Advanced WP-560 便携式冲牙器约￥490-￥560

dead as the proverbial doornail.The outstanding folks at Waterpik Customer Service informed me that you have to disconnect the charger or the battery WILL fail! I'm guessing that type of charger can't detect when the battery is fully charged to turn itself off. It is not specified in the manual (and it should be in bold print!).. I discovered the issue 1 day after the 30 day return period to Amazon. Amazon Customer Service said call the manufacturer and gave me the number.I wish all customer service was like this when there are product issues. They transshipped a replacement product and are sending me a mailing label (on their dime) to return the non-functioning unit. No hassle, no fuss. I've used corded Waterpiks for years but got tired of packing it with my toothbrush when I travel. I always run the corded unit on max setting (about 100psi per customer service) and portable unit runs anywhere from 45-75 psi. There's a noticeable difference, but it gets the job done when you're on the road. I'm glad I didn't return the unit to Amazon.Only gave four stars since the unit charger will not automatically turn itself off. Now I just have to remember to turn it off after 4 hours (probably some slack there) and ensure it's charged before I travel. However, estimated time to fully charge is only 3-4 hours and if used daily, maybe charge it once a week. I can live with that.

s for water flossers, but I finally found some NIH articles showing that it does, in fact, work better than string flossing (search for the phrase: NIH water string flossing). So I got this unit myself and was surprised to find first-hand that it works as well and perhaps better than traditional floss--my mouth felt cleaner than it usually does after flossing, and when I followed up with string flossing (to see if it would get anything the water flosser hadn't), all was clear.PROS* Works better than traditional string floss - leaves your teeth cleaner* Has different strength settings so you can adjust* Comes with multiple tips. Most of the ones with brushes say they'll need replacing after 3-6 months, but the one that's just a clear plastic tube seems like it will last longer* Battery charger is magnetic - you set the unit down on the counter, plug in the charger, and then magnetically attach the charger to the front of the unit (I tried attaching it backwards or too high / too low, and it just realigns itself to be correct, so it's super easy)CONS* It's quite big - maybe 10 inches tall and 4 inches at the base (while string floss is teeny tiny), though fortunately it's easy to hold and not heavy* Has a learning curve (probably less of one than string floss, but most of us already know how to string floss)... nothing bad, but it takes a while for it to become a _habit_ to not turn it on outside your mouth (which just shoots water across the room, as you'd expect, and is easy enough to clean up)NEUTRAL* You may have to fill the water reservoir at the bottom a few times during flossing... but this is easy to do, and I'm glad they didn't just make the unit even bigger than it already is* The instructions say you can use the unit in the shower, which would be nice to keep down the mess while you're getting through the learning curve, but I don't like the logistics of refilling the empty reservoir while showering***************UPDATE: three months later, the battery is failing even though I leave this plugged in all the time (except when using it). The battery can no longer make it through a single flossing so I have to switch back to manual floss partway through. In doing so, I found that even though most of the time my mouth feels cleaner with water floss (vs. traditional string floss), there **were** a few pockets where normal flossing again made my gums bleed (a sign that the water floss wasn't getting in there well enough). So I'd suggest that you continue to string-floss on occasion for those benefits. Lowering rating to just 3 stars out of 5 because there's no excuse for a battery failing to hold a charge after just 3 months; otherwise I'd probably do 4 stars.***************UPDATE 2: After another 3 months of just flossing 1/2 my mouth with water (when battery would die) and then switching to string floss, I finally got around to calling customer service. I wish I had done it sooner! Within 15 minutes they had a new unit on its way to me. I did have to read them my serial number to confirm the purchase, and I'm mailing the old one back (so they can test and see how/why/where it failed). But my new one is now in hand and working well so far. Raising to 4 stars because I don't yet know if this one will last, and also because I do still need to string floss on occasion. But overall I'm happy again.

oes not provide the same gum massage or between-teeth-cleaning benefit as the corded model. I do like the results, vs floss, from regular use of the corded model and will keep this unit only for trips.