This article is from the Frisbee Dogs FAQ, by Kevin Robair with numerous contributions by others.
If you are using plastic discs, you need to maintain them. Keep them
clean, since dirt on a spinning disc acts just like sandpaper on your
dog's teeth. The dishwasher is a great place to clean discs! Also, the
disc should be kept smooth. As a disc is used, it develops cuts and
sharp dings that can cut your dog's mouth. Rather than simply throw
them out, try sanding them:
Flexible Sanding Block
This tool can be found at any hardware store. It is a foam block that
is covered with sandpaper, and easily conforms to the shape of a disc.
It is better than regular sandpaper since it is not affected as much
by water ( or dog slobber! )
Plumber's "Cloth"
This is 'sandpaper' for copper and pvc pipe. It comes in a roll of 1
inch wide "cloth" and can be easily torn into small pieces and used as
needed. Since it is designed for plumber's, it is nearly impervious to
water and slobber.
 
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