Despite the "advice" of the dental hygenist mentioned below, please do not use a diluted bleach solution to clean your teeth. Bleach is toxic. Use diluted Listerine or other antibacterial mouthwash.I bought this model, and the jury is still out as far as reliability. Mine worked the first time, at least. I have to agree that it is amazingly loud, even with a towel underneath. And yes, I fear my neighbors will think I'm running a lawnmower in the bathroom. The tongue scraper attachment seems worthlessly small; buy a stainless steel one instead for $3. Yes, the cord is too short and the unit is difficult to maneuver. But if you follow the directions enclosed in the package, you won't make such a huge mess.