As a parent, you do not give attention to any behavior that is unacceptable.

Any attention given to a child during a tantrum is attention; the child quickly learns a tantrum gets rewarded because you react. Any attention given from a behavior, whether it’s from good or bad behavior is “attention”.

If a child is in a tantrum, no matter how extreme it gets, ignore the behavior. Your tantrum problem will be solved in less than a week.