Since baby teeth just end up falling out, why not let the cavity fall out with the baby tooth? Because some primary teeth will be in your child’s mouth until the age of 12, losing a baby tooth too early due to decay, infection, or accidents can cause other teeth to shift. This could lead to eruption or crowding issues with the permanent teeth. Visiting your child’s dentist every 6 months will help them catch problems when they are small. A filling can be an inexpensive and easy way to maintain good dental health and prevent pain and infection.