Babies can start teething as soon as three months but normally for most babies teething beings around six to seven months. The first teeth that will usually appear will be the lower incisors (front teeth). As your child grows and develop more teeth, you can use a toothbrush that is designed for your child’s age. Avoid using toothpaste that contains fluoride until your child is old enough to understand that swallowing the toothpaste should be avoided.