Most children lose their last baby tooth around age 12 or 13. The process starts much earlier, typically around age 6, and follows a predictable pattern from front teeth to back molars over roughly six to seven years.
The Full Timeline of Baby Tooth Loss
Baby teeth fall out in roughly the same order they came in. The bottom front teeth (central incisors) go first, usually between ages 6 and 7. The top front teeth follow between ages 7 and 8. From there, the process moves outward and backward through the mouth.
Here’s the typical sequence based on data from the American Academy of Pediatric Dentistry:
- Central incisors (front teeth): 6 to 8 years old
- Lateral incisors (next to the front teeth): 7 to 9 years old
- Canines (pointed teeth): 9 to 12 years old
- First molars: 9 to 12 years old
- Second molars: 9 to 13 years old
The last teeth to go are almost always the second molars, the ones sitting farthest back. Lower second molars tend to fall out between 11 and 13, while upper second molars can shed slightly earlier, between 9 and 12. By age 13, most children have lost all 20 baby teeth and have a full or nearly full set of permanent teeth in place.
Why Baby Teeth Fall Out
Baby teeth don’t just loosen and drop on their own. The process is driven by the permanent teeth growing underneath them. As a permanent tooth pushes upward, specialized cells break down the root of the baby tooth above it. This root gradually dissolves, which is why a baby tooth feels increasingly wobbly before it finally comes out. By the time it falls, the root is almost completely gone, which is also why lost baby teeth look so small and hollow at the base.
Chewing and normal jaw growth add mechanical pressure that accelerates this process. The tissues surrounding the baby tooth’s root respond to that pressure by releasing signaling molecules that ramp up root breakdown. It’s a tightly coordinated system: the permanent tooth essentially clears its own path into the mouth.
Why Some Kids Lose Teeth Earlier or Later
The age ranges above are averages, and plenty of healthy kids fall outside them. Some children lose their first tooth at 5, while others don’t lose one until 7. Girls tend to lose teeth slightly earlier than boys. The timing is largely genetic, so if you lost teeth early or late as a child, your kids may follow the same pattern.
A child who hasn’t lost any teeth by age 8 or who still has baby teeth at 14 may benefit from a dental X-ray. The most common reason for a baby tooth that won’t budge is that no permanent tooth developed underneath it. Without that permanent tooth pushing upward and triggering root breakdown, the baby tooth has no reason to loosen. This congenital absence of one or more permanent teeth is more common than most parents realize, affecting roughly 2 to 8 percent of the population (excluding wisdom teeth).
Other causes of delayed tooth loss include crowding, where permanent teeth don’t have a clear eruption path, or the permanent tooth growing in at an angle that misses the baby tooth root entirely. Certain medical conditions like hypothyroidism, Down syndrome, and some genetic disorders can also slow tooth development overall.
What Happens After the Last Baby Tooth
Once all 20 baby teeth are gone, kids still have more dental milestones ahead. The second permanent molars, sometimes called “12-year molars,” erupt between ages 11 and 13. These don’t replace any baby teeth. They grow into empty space at the back of the jaw. Wisdom teeth (third molars) follow much later, typically between 17 and 21, though many people never develop them or have them removed.
The period between ages 6 and 12, when kids have a mix of baby teeth and permanent teeth, is called the mixed dentition stage. It’s a normal and sometimes awkward-looking phase. Permanent teeth often appear oversized next to remaining baby teeth, and gaps are common while the mouth catches up. This is also the window when orthodontists prefer to do an initial evaluation, since the jaw is still growing and easier to guide.
Loose Teeth That Need Attention
Most loose baby teeth handle themselves. Gentle wiggling is fine, but forcing a tooth out before it’s ready can damage the root or surrounding tissue. If a baby tooth has been loose for several months without progressing, or if a permanent tooth is visibly erupting behind or beside a baby tooth that hasn’t fallen out, a dentist can evaluate whether the baby tooth needs help coming out.
Permanent teeth that feel loose are a different matter entirely. Unlike baby teeth, permanent teeth should never be mobile. Looseness in a permanent tooth after a fall, sports injury, or for no apparent reason warrants prompt dental evaluation, regardless of the child’s age.