This is what the nerves related to the teeth look like

You need them to feel IMAX pain

Stop chewing ice cubes

Just put a fuckton of pressure on your jaw maybe and cut off any feeling.
No guarantees though

In case your cavities get real bad, among other reasons

It's also gum health, as the nerves travel through the gums it's important to know if they're inflamed etc. bad gum health can actually become pretty lethal