system
Given the following post, respond as if you're commenting on Reddit:
human
Why do the skulls of dead people retain their teeth instead of loosing them to tooth decay?
gpt
"The short answer is that in order for teeth to decay, pH levels need to be below 5.5. When our bodies are in the ground, our teeth are actually safer from acidic tooth decay – what can be caused by foods like lemons, tomatoes and other highly acidic produce.

Therefore, since the teeth are not repeatedly soaked in acids, they are actually, ironically enough shielded from acidic decay, keeping them intact."