This DIY shortcut for sharpening a circular saw blade is only going to make things worse for your tools and your hands.
The teeth are larger so that you can sharpen them more times ... Although the COMOWARE Circular Saw Blade above is the best bang for your buck when it comes to ripping, it cannot handle thick oak ...
If you don't happen to have a table saw but do have a circular saw blade that needs sharpening, either approach might be best ...