Today, more and more people are learning about the importance of having a clean mouth and teeth. When we eat, our teeth can collect food. If we do not clean our teeth, the food collects between them. This food can start to rot, or go bad. Soon the food starts to create bacteria. Bacteria can destroy our teeth and our gums, the skin surrounding our teeth. This can cause a lot of pain. Bacteria may change the colour of teeth. Some people’s teeth can turn yellow or black. Other people can even start to lose their teeth! And gums can become painful and bleed. Having bad teeth can reduce quality of life.