Rich said: cheaper carbide blades losing their carbide chips while cutting metal. Spend the money.
not necessarily..... Carbide is a very brittle metal. It does not have
to hit a nail or hard pine knot to break a cutter off. Handling it
roughly by just tossing it into a drawer or dropping it on the floor
could chip a tooth. The same is to be said about expensive router bits.
Do not keep router bits in a can or tupperware box !!
If you have a blade that you paid $20-100 for, and it chucked some teeth,
you can take it to a tool sharpening shop and they can replace the carbide cutters,
give it a good cleaning and "slightly" sharpen the rest of them for about $10.
so you don't have to toss a good blade just because a tooth or two is gone.
also - don't let residue build up on blades and store them lightly oiled in a drawer,
https://www.dekalbsaw.com/sawfaq.html
.