We suggest you slowly introduce a finger toothbrush or tooth brush prior to their first tooth erupting to get them familiar with having something new in their mouth. Routine tooth brushing is important even for baby teeth, as decay can cause your child pain and discomfort and could threaten the health of their adult teeth. Most toothpastes are suitable for kids even those with fluoride but toothpaste aimed at children typically has a mild or more palatable taste to children making brushing time that much easier.