Yes, locs can be combed out. It is a very tedious process however it can and has been done. The older part of the loc (which is the tips) will be the hardest. The easiest is the part of the loc that is closes to your root because it’s the most recent part of the loc that has been twisted or groomed. Because it takes time for a loc to matte, this is why the oldest most matted part of the loc is at the bottom.