By the way, here is how to sharpen the teeth:
1. Using a conventional steel grind wheel, grind the steel back away from the carbide tooth; far enough to allow the carbide to be sharpened. The steel will ruin a green wheel by plugging up the grit, and a diamond wheel by ripping the diamonds out of the matrix. Don't skip step #1, you've been warned!
2. Using a wheel hard enough for carbide, grind the exposed carbide back to where it is sharp. Don't try too hard for a "sharp" edge, as this will just chip off. Grinding to about 75°-80° face angle is about where they come from the factory. Keep grinding until you have taken off the rounded edges.
NEVER let a diamond carbide grind wheel get hot or press hard into the wheel. It looses the diamonds and then doesn't work. Those little diamonds are impregnated into a special matrix, and it doesn't like heat or pressure. So...grind slow to make the $$$ wheel last longer.
Oil or emulsion grinders are coolest and best, but who can afford that kind of equipment?