There are multiple ways to seal the ends of yarn braids; however, the most common involve fire or heat. You can twist or knot the ends and melt the yarn with a lighter, trimming off any excess. Alternatively, you can tie off, then trim, and melt the ends with a flat iron, which is a slightly less risky option. Finally, for a non-fire choice, brush out the last inch of the braid to matte it slightly, and then plait to the end, giving it a final twist between your fingers. The matting will help the strands hold together.