Cracked - junk. Dings, not in the contact area - die grind the sharp edges smooth and use. Would not sell to someone. Use it, give it away to someone willing to use it or scrap.

Picture is hard to see. Looks like a crack on the one tooth which would disqualify it from being trusted.

Used gear that is not rare may not be worth fooling with. Something expensive or not easily replaced, I would fix it if I needed to use it, depending on the crack..