You can start using a toothbrush for a baby as soon as they start teething. However, it must be a small, soft brush that will be gentle on their sensitive gums and teeth. You can start brushing the child’s teeth after meals as well as at bedtime. These steps will help remove plaque so as to prevent tooth decay. Once you find out the edges of a toothbrush have turned rough, you should toss it to avoid any encounter with bacteria buildup.