Their teeth; their power and instruments of doing mischief. He mentions teeth, partly because the adder's poison lies in its teeth; and partly to make way for the following metaphor. The great teeth, called the grinders; which are more sharp and strong than the rest, and more used in breaking and tearing what they are about to eat.
Related Commentaries of Psalms 58:6
Psalms 58:6
6 Break their teeth, O God, in their mouth: break out the great teeth of the young lions, O LORD.