system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't our bodies prevent tooth decay without the help of toothpaste?
gpt
We eat WAY more sugar than our teeth really evolved to handle. If you look at ancient skeletons (from before agriculture) you find a lot of people with really nice looking teeth. So, with modern living comes modern problems that need modern solutions to fight them.