My dental hygienist recommended this Water pik. I ordered it and am using it. However, it doesn't seem to be very effective. Maybe long-term it will make a difference.
Not as strong a jet as the corded model but works very well for a mobile unit. Battery life is great. I use mine at my work site and initial charge has lasted over two weeks already.
This is a great product except for one design flaw. I bought this for travel to locations where I did not have electricity. When packing, the "ON" switch is too prominent, and it turned on in my luggage several times. A slider "on" switch or a cover would have made this a perfect travel model.
The WaterPik does a great job with the teeth and gums. The main reasons to give 4 stars are (1) these units have a tendency to fail after a year or two of use even when one uses vinegar to rinse it periodically and (2) the rechargeable batteries are very difficult to remove to recycle them when the unit does fail.