I don't have a sweet tooth (I'm one of those weird women that doesn't actually care much for chocolate, even), but my dh has a MAJOR sweet tooth.
He eats fruit when he wants something sweet and it seems to stop the crave. In fact, over the past 2 years, he's lost 70lbs. and most of that was from not snacking on sugary treats anymore and replacing them with fruit. He said it was just a matter of getting into the habit of killing the cravings with fruit. (I know, you said fruit isn't working... just saying that if you keep it up, it will become a habit, that's all.)
For me, when I have the rare craving, I like a glass of sweet tea.