> If they don't wear down their teeth, they'll grow out of control and kill them. cf the Babirusa - "If a male babirusa does not grind his tusks (achievable th

> If they don't wear down their teeth, they'll grow out of control and kill them. cf the Babirusa - "If a male babirusa does not grind his tusks (achievable through regular activity), they can eventually keep growing and, rarely, penetrate the individual's skull."[0] [0] https://en.wikipedia.org/wiki/Babirusa https://en.wikipedia.org/wiki/Babirusa