How to make a block damage you when you collide with it?

I'm making a fangs block that ''bites'' you when you collide with it, the problem is that i want it to make damage when touched in ALL the positions, so when entity walks on block dont works cuz it only works on the top part, what can i do?

PD: A resume will be that i want a block to deal damage everytime you touch it in all of the block faces