Chainsaw chains don't last forever, and you can only sharpen them about 10 times or so before you'll have to replace the entire chain. With the extra power of rotary tools like a Dremel ...

Pro tip: Ensure you use the correct file size to match your chainsaw’s saw chain. Also ... replace it instead of sharpening ...

you can buy a $60 kit that's compatible with most major-brand chain saws and lets you sharpen the saw yourself in seconds. Sold at Home Depot, Sears, and other retailers, Oregon's PowerSharp comes ...