I came to the start of the broken teeth, and there is a well-defined path going to the left. It seems that one either climbs up to the top of the tooth on the right, or drop down farther to the left. I backtracked and took off my ribbon. I looked and looked and could not find any alternative. I went back on the left, and explored the drop-down alternative.
Footing becomes treacherous, and the slope left becomes very steep.
I climbed back up and proceeded to go up to the top of the tooth. Miraculously, there is a gap I could squeeze through, and a crack that goes down into a nice ledge. I looked ahead, and saw several more ribbons on the ridgetop, on top of the teeth. So those guys did negotiate these teeth by walking on top. Encouraged by the ribbons, I gingerly went forward, knowing that the Ironwoods is almost there.