system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If plaque is bacteria from food, why is it white?

When you get to the end of a day and are just about to brush your teeth, you have a small bit of white plaque. If you eat food that's chocolatey or strong in colour, why does the plaque not stay that colour? Sorry if this is really obvious and stupid.
gpt
Because it isn't bacteria from food. Plaque is produced by bacteria that live in your mouth. The reason it shows up after eating is because the bacteria use the sugar in your food as tgeir energy source and the more energy they get, the more active they get and so they produce more plaque.