Teeth can need work from physical trauma, too. Getting hit in the head while hunting or fighting or just hiking might cause a cracked tooth, which can be deadly in the absence of dental care. Or just while eating, sometimes a stray rock or bone fragment or shell might cause an issue.
Lots of other species can regrow teeth in adulthood, even a handful of other mammals. All sorts of animals can have tooth problems in the wild, so I wouldn’t assume that prehistoric humans were exempt from that general danger.
Sure. All sorts of things would kill you, and a dental injury would be a crap way to die. The ancient stuff is from preserved hunter gatherer skeletons.
We, fortunately, have excellent dental care available so people hardly ever die of a broken tooth, I know about my lack of cavities from a pair of several x-rays and a check up while replacing a filling from when I ate the common diet
