Good dental hygiene habits should begin before your child's first tooth comes in. Wiping your baby's gums with a soft damp cloth after feedings helps to prevent the buildup of bacteria. When teeth appear, start using a soft children's toothbrush twice a day.
Once your child is preschool-age, start using fluoride toothpaste. Don't cover the brush with toothpaste; a pea-sized amount is just right. Young children tend to swallow most of the toothpaste, and swallowing too much fluoride toothpaste can cause permanent stains on their teeth.