Place the DeWalt blade, with the teeth facing up, into a vice grip. Secure the vice on the blade as tightly as possible. Don't allow the teeth to clamp, only the face of the saw.
Start at one end of the blade and file the beveled side. Follow the angle of the first tooth. Do not try to reshape the tooth, but simply file the edge of the blade.
Glide the file along the beveled edge, in a back-and-forth motion, while using medium force. Repeat about four times on the tooth.
Continue to file all the teeth on the saw.
Turn the blade around if the beveled edges are on both sides of a tooth.