Mystery #3Tier 2the body / teeth / germs
Why do teeth go bad and get holes if you forget to brush them?
Leave your teeth unbrushed for long enough and they can grow tiny holes, as if something has been drilling into them. But nothing is biting your teeth, and stone-hard enamel does not just crumble on its own. So what is quietly making the holes?
Your guess
What do you think builds up on unbrushed teeth and makes the holes?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.