You read some people's testimonies and may not know the whole story. Most people who get sick are sick because what they eat, not because they fast. Yes partial eating can lead you to starvation and you can die. But if you don't eat and drink water only, your body heals itself.
If nature did not have this program in all living things, nature would fail. My dog stopped eating everytime she was sick and got better. All animals fast, but the two legged ones got intelligent and lost their natural sense of listening to the body.
You actually will worsen your teeth with what you ate, all processed junk, except for cherries, and not by fasting.
Well, we all make these mistakes. Just learn from it and then retry.