system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 - Why do skeletons teeth not fall out?

Our gums help keep our teeth in place and they can fall out so how so skeletons keep theirs?
gpt
Teeth fall out when bacteria have so thoroughly destroyed the root that they break off.  Gums keep them out, but the gum tissue doesn't provide any structural strength.

Those bacteria are slow workers and rely on your body heat and food intake to do their nasty business.  When you die, they usually die too long before they can do much damage to the teeth and bone.

Other bacteria can eventually work through the bone over time though, depending on where your body ends up.  Not all skeletons survive indefinitely, and those that do can be badly damaged.  Teeth do sometimes fall out.