system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: why do humans brush their teeth even tho no other animal does it.
gpt
We're one of the few animals to eat a high-carbohydrate diet, a diet only possible because we grow grains as crops with agriculture. Because we eat carbs, we leave lots of delicious bits of sugar behind on our teeth for bacteria to feast on, causing tooth decay. If we don't brush, we can get painful cavities and our teeth can fall out. This is a huge health problem, and was even worse before modern oral hygiene practices.

Domestic dogs that eat corn-based dog food also need to have their teeth cleaned, which wild dogs don't need. Luckily there's chewy dog treats you can give your dog that do a decent job at cleaning their teeth so you don't have to do the unpleasant task of literally brushing your dog's teeth with a toothbrush.