Helmet matters...

[KnottedYet]

A fall is an impact.

Whether or not your brain is inside the helmet at the time.

Dropping it from car height onto asphalt multiple times is probably not a good thing. Dropping it onto carpet in an apartment probably isn't bad. Get in the habit of keeping the helmet in stable places, don't leave it on top of your car, don't fling it around. If it helps, buy a little basket and place it on a shelf indoors for storing your helmet, and travel with it in the backseat of your car rather than rattling around in the trunk.

[Melalvai]

I have troubles with dropping it too, and I'm trying to be better about that, like she said setting it down in stable places. On the floor instead of the trunk of the car.

Check the inside for visible fractures. However there can be invisible fractures. But if there are visible ones you know for sure it needs replaced.