Most parents assume baby teeth don’t have roots. Parents often find this surprising and ask, “Wait, do baby teeth have roots?” Yes, they do. Baby (primary) teeth have real roots that anchor them in the jaw, just like adult teeth.
However, as the permanent tooth develops underneath, the root gradually dissolves until there’s not enough to hold the baby tooth in place. That is when it falls out. That’s also why a baby tooth’s root is never visible when it comes out, because by then, it’s already mostly gone.
What is the Structure/Anatomy of Baby Teeth?
A baby tooth isn’t just a smaller, simpler version of a permanent tooth sitting loosely in the gum. Yes, it has the same basic structure, including the crown, a root below the gumline that holds it in place, internal layers (the dentin and pulp) and its own nerve and blood supply.
That said, there are a few things that set baby teeth apart structurally:
- A thinner enamel, which is part of why cavities can progress faster in baby teeth than in adult teeth.
- A whiter appearance because thinner, more translucent teeth let the whiter underlying structure show more clearly.
- Smaller overall size, scaled to fit a much smaller jaw.
- A shorter crown height compared to permanent teeth.
What Happens to the Roots When Baby Teeth Fall Out?
As your child grows, the permanent tooth doesn’t wait for the baby tooth to fall out on its own. It forms inside the jawbone, between the baby tooth’s roots. Then, as the permanent tooth develops and erupts, the body gradually resorbs the primary tooth’s root.
This process, called resorption, is where cells break down and absorb existing tissue into the body. When this happens, the roots dissolve completely and the tooth loosens. Since it no longer has an anchor to keep it attached to the jawbone, baby teeth eventually fall out.
Baby tooth roots are never visible when a tooth comes out, because by that point they’ve already been almost entirely dissolved.
Why Does This Matter?
Knowing baby teeth have roots isn’t just a fun fact. It’s worth understanding properly, because it changes how you should think about baby tooth injuries, cavities and how baby teeth should be cared for and treated.
Decay Can Become Painful And Spread
Like in an adult tooth, a cavity that reaches the root in a baby tooth can cause pain and become infected. Left untreated, this can even affect the development of the permanent tooth. This is why the reasoning “it’s just a baby tooth, it’ll fall out” doesn’t quite work.
Baby Teeth Don’t Always Fall Out
While most baby teeth loosen naturally as their roots resorb, occasionally, a permanent tooth can develop slightly off-course or the root may not resorb properly. In such instances, the baby tooth may need to be extracted instead.
Root Treatment Doesn’t Affect The Adult Tooth
Baby teeth have their own independent nerve, separate from the permanent tooth developing beneath. If pulp treatment is required in the case of damage to the pulp of a baby tooth, it won’t have an impact on the nerve of the adult tooth waiting to erupt.
Early Tooth Loss May Need A Space Maintainer
When baby teeth are lost much earlier than expected, nearby teeth can shift into the space intended for permanent teeth. In such cases, your baby may need a space maintainer to hold the gap. The need for a space maintainer depends entirely on the child’s teeth, bite, development and likelihood of teeth shifting.
Can an Injury to a Baby Tooth Affect the Permanent Tooth?
Sometimes, which is why this is worth knowing before it happens, not after.
Baby teeth are more fragile than permanent teeth, and a hard knock (a fall, a bump during play) can push a tooth up into the bone or damage it in ways that aren’t obviously noticeable. Because baby teeth sit close to the developing permanent tooth, in some cases that impact can affect its development too.
If your child had a significant knock to a baby tooth, it’s worth having a dentist check it, even if the tooth looks fine on the surface.
How Should I Care for Baby Teeth?
Sure, baby teeth are temporary. But that doesn’t make them unimportant. They help children chew and speak clearly while holding space for permanent teeth that develop underneath. So, here are some simple ways to care for your child’s teeth and gums:
- Start an oral hygiene routine as early as possible. You can start with wiping gums with a clean, moist washcloth even before teeth appear.
- Avoid putting your child to bed with a bottle, as liquid can remain around the teeth and increase the risk of decay.
- Phase out the bottle and introduce a regular cup as soon as your child is ready. Reducing prolonged bottle use can lower the risk of tooth decay.
- Choose tooth-friendly foods and drinks, and limit sugary and sticky foods.
- Book a first dental visit around your child’s first birthday or when their first tooth appears. An early visit can set the stage for good oral hygiene habits and help parents learn more about caring for their child’s teeth.
Have you noticed anything unusual about how your child’s teeth are coming in or falling out? Contact Ashgrove Dental for a children’s dentistry appointment, without waiting it out.
