Red and Bad for Your Teeth

This is a classic riddle where the answer is a literal object that matches the description. It's funny because you're likely thinking of something sweet like candy and not a piece of building material.

• Brick
• Teeth
• Dead
• Morbidity
• Bad
• Stupid jokes

• What's brown and rather bad for your dental health? - A baseball bat.
• What’s big, red, and eats rocks? A big, red, rock eater.
• What's blue and bad for your teeth? A green brick that's painted blue after the original paint dries (it takes a little while to dry), but after it dries you can paint it and then it will be green. If the brick is green it is called a green brick as it is green (not blue anymore) and it hurts your teeth because brick is a hard material that can damage the bones in your mouth (also known as your teeth).
• What's red and smells like blue paint? Red paint.