I've gotta go with the reply that said if it's not broke, don't fix it. Unless you're having problems with feeding, just say no to the dremel.
If you're having feeding problems take it to a qualified 'smith...
If you simply must fug with it, I'd suggest a super light rubbing with 400 grit paper as recommended by mete above. Do not put the dremel on it though, unless you're willing to ruin it.