I would explain to the child's mother that unfortunately, teeth cannot repair themselves in the same way that bones and other parts of the body can. However, there are options for repairing the chipped teeth, such as dental bonding or veneers, depending on the extent of the damage. I would also explain the importance of seeking prompt dental care for a dental emergency, as delaying treatment can lead to further damage and more extensive treatment in the future. Finally, I would provide the child and his mother with information about how to prevent dental injuries in the future, such as wearing protective gear while riding a bicycle or participating in sports.