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According to the CoD wiki, you don't actually get teeth for not going down. Here is the list of all the things that give teeth: It's also important to note you only get extra teeth with up to 3 relics. Any more than that, and you are just challenging yourself for no extra reward. I'm by no means an Extinction expert, but the way I've just earned teeth was playing PoC public matches with three of the easiest relics on on regular difficulty. It's more fun that way IMO than existing boosting methods, and I would end up with around ~10 teeth per match depending on the competency of your teammates with challenges.