Jay already explained but silicon carbide dust is bad stuff. http://nj.gov/health/eoh/rtkweb/documents/fs/1658.pdf
I got diamond wheels after using one, the dust gets everywhere. And I use a good mask with the diamond wheels even though they reckon you don't need to.
Pity you both aren't a bit closer. I bought a tooth sharpening set up a few years back, it's done two teeth. Works well but I never got the sharpening plan going, and I got a super deal on teeth just after I bought it.
If that's a green wheel Mike, be careful or just throw it away.
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