Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ultrasonex SB300U Rechargeable Toothbrush

The Ultrasonex SB300U Rechargeable Toothbrush is the best I ever had.Unlike most reviewers, I had it for over 3 years AND I own bothSoniCare and Braun toothbrushes, each in almost all versions[I have been using electric toothbrushes for about 30 years].Nothing beats the Ultrasonex SB300U Rechargeable Toothbrush.I use it together with the Braun mouth irrigator [I own at least 5 of thosetoo but the Braun is the best]. BTW, I found that most dentistsknow nothing about electric tooth brushes and irrigators except whattheir salespeople tell them. So it is pretty stupid when a reviewer refersto a dentist. BTW, this is the 1st review I ever wrote for Amazon.Paul Nevai [I am just a tremendously satisfied customer]N.B. For the best effectiveness, just brush with it as if it were a regular toothbrush.