Dentists suggest gently brushing baby's gums even before teeth erupt. Use a soft cloth or gauze after each meal. This gets the child used to it so he will be accustomed to brushing when that first tooth finally makes an appearance. Flossing should begin as soon as teeth erupt next to each other. Your child should be encouraged to brush and floss on her own as soon as she is able.
Children's teeth should also be brushed after they are given medicine, due to the high acid content contained in many medicines for children. I've heard people refer to "baby teeth" as being less important than the "permanent teeth" that ultimately replace them. Healthy teeth are important to a child's complete health and development. Dental sealants and fluoride can also help.
As the saying goes, an ounce of prevention is worth a pound of cure. Taking care of your teeth from the very beginning can prevent the need for those implants in adulthood. Go to the dentist.