Reply by IsaacH

Pine is actually very easy on a saw blade provided you keep it clean. Letting resin build up can cause friction and heat that can warp a blade. Same with treated wood. You can get cleaners especially for desolving wood resins off of blades but goof off works pretty good. (unofficially kerosene works better)

If you are having to apply more than slight pressure to the wood to get it to feed into the blade and cut, or if you are regularly burning the wood while cutting(though some species will burn very easily), its probably time to replace the blade. Don’t bother sharpening blades unless your forking out top dollar for your blades. The trouble and expense aren’t really worth it otherwise.

-- Isaac- Decatur, GA - "Your woodworking....NOT machining parts for NASA!!!"