This Panasonic model is so much better than the similar Waterpik I had to throw away owing to its rubbish rechargeable battery. On this Panasonic the AA batteries seem to last long enough before needing replacement.

I already have one of these excellent gadgets and I am now buying one for my son. Even after cleaning my teeth with an electric toothbrush and then rinsing with Dentyl, the irrigator then demonstrates in the sink how much bacteria-causing residue was still lodged between my teeth. I recommend this model to everyone.