What is that strange toothed part on kitchen scissors for?

Place the jar lid between the ridges.

Hold the scissors in one hand and the jar in the other.

Twist.

The grooves help grab onto the lid, while the leverage spreads the pressure evenly. Suddenly, that stuck lid doesn’t feel so impossible anymore. This works for small bottle caps, too—like soda or sauce bottles.

For anyone with limited hand strength or arthritis, this feature can be a real lifesaver.