Use a soft cloth to clean your baby's gums. Start a few days after birth, and do this until the first teeth come in.
When your child's teeth start to come in, you can start cleaning them. Use a soft toothbrush and a very small amount of toothpaste. Flossing can begin when teeth start to touch each other.
Daily cleaning removes plaque, a sticky film of bacteria on the teeth. If plaque isn't removed, it can build up and harden into tartar. The bacteria in plaque and tartar use sugars in food to make acids. These acids can cause gum disease and tooth decay, like small holes (cavities).