Snakes’ mouths are designed, both shape and material-wise, that, for the most part, they will not hurt themselves with their teeth. Many snakes have their fangs hidden in their flesh, think the Wolverine’s retracting blade claws.
The venom of a snake cannot kill the snake which carries it. Snakes have a natural immunity to their own venom. Their bodies produce natural anti venom in case of an instance of self-poisoning. Snakes CAN however poison other species of snakes ~~who themselves are less venomous~~
EDIT: A commenter below provided sources that said some snakes can die from their own venom but many cannot.
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