Most children lose their first baby tooth around age 6, and the process continues until age 12 or 13 when the last baby teeth are replaced by permanent ones. The full transition spans about six to seven years, with teeth falling out in a fairly predictable order that mirrors the sequence they originally came in.
The Typical Timeline, Tooth by Tooth
Baby teeth don’t all fall out at once. They loosen and shed in stages, starting with the front teeth and working back toward the molars. The lower teeth generally fall out before their upper counterparts.
Here’s what to expect based on data from the American Academy of Pediatric Dentistry:
- Lower central incisors (bottom front teeth): 6 to 7 years
- Upper central incisors (top front teeth): 7 to 8 years
- Lower lateral incisors (next to bottom front): 7 to 8 years
- Upper lateral incisors (next to top front): 8 to 9 years
- Lower canines (bottom pointed teeth): 9 to 11 years
- Upper first molars: 9 to 11 years
- Lower first molars: 10 to 12 years
- Upper canines (top pointed teeth): 11 to 12 years
- Upper second molars: 9 to 12 years
- Lower second molars: 11 to 13 years
These ranges are averages. The AAPD notes that many otherwise normal children don’t conform strictly to this schedule, so a year or so of variation in either direction is common and rarely a cause for concern.
Why Baby Teeth Fall Out
A baby tooth doesn’t just get pushed out by the permanent tooth growing beneath it. The body actively breaks down the root of the baby tooth through a process called root resorption. Specialized cells called odontoclasts dissolve the root material, while related cells remodel the surrounding jawbone to make room for the incoming permanent tooth. This is why a baby tooth that’s ready to come out has almost no root left. If you’ve ever looked at one your child lost, you probably noticed it looked hollow or flat at the base.
Cells inside the tooth’s inner tissue also play a role, triggering the formation of these root-dissolving cells through a signaling system that coordinates the whole process. As the root dissolves, the pulp tissue inside the tooth gradually breaks down too. The result is a tooth that gets progressively looser over weeks or sometimes months until it detaches with minimal bleeding or discomfort.
The Mixed Dentition Stage
From roughly age 6 to 11 or 12, your child will have a mix of baby teeth and permanent teeth in their mouth at the same time. Pediatric dentists call this the “mixed dentition” stage, and it’s completely normal for things to look a bit uneven during these years. Permanent teeth are larger and more yellow than baby teeth, so the contrast can be striking when they sit side by side.
This stage also includes the arrival of the first permanent molars around age 6, which come in behind the last baby teeth rather than replacing them. These are easy to miss because no baby tooth falls out to signal their arrival. By around age 12, most children have transitioned to a full set of permanent teeth (minus wisdom teeth, which come much later if they come at all).
When a Tooth Falls Out Too Early
Losing a baby tooth well ahead of schedule, whether from a fall, a cavity, or an underlying health condition, can create problems for the permanent teeth waiting below. Baby teeth act as space holders. When one is lost prematurely, the neighboring teeth can drift into the gap, leaving the permanent tooth with less room to come in straight. This can lead to crowding, teeth erupting in the wrong position, or permanent teeth getting stuck beneath the gumline.
If your child loses a baby tooth more than a year before the expected timeline, a dentist may recommend a space maintainer, a small device that holds the gap open until the permanent tooth is ready to emerge.
When Baby Teeth Stick Around Too Long
Sometimes a baby tooth refuses to budge. An “over-retained” baby tooth is one that stays in place past the age when it would normally shed. This can happen for a few reasons. The most common is that the permanent tooth beneath it is missing entirely, a condition that affects a small percentage of children. Without a permanent tooth sending the signals that trigger root resorption, the baby tooth has no reason to loosen.
Other causes include the baby tooth fusing to the jawbone (a condition called ankylosis) or the permanent tooth developing at an unusual angle so it can’t push through normally. If your child’s teeth are falling out in an asymmetric pattern, with one side progressing normally while the matching tooth on the other side stays put, that’s worth bringing up with a dentist. Asymmetric eruption can sometimes signal a missing or blocked permanent tooth, or occasionally a small extra tooth that’s interfering with the process.
Does Gender Affect the Timeline?
Girls tend to lose their baby teeth slightly earlier than boys, which tracks with the broader pattern of girls reaching developmental milestones a bit sooner. The difference is modest. Research on tooth eruption timing shows boys and girls are separated by roughly two weeks when baby teeth first come in, and that small gap carries forward throughout childhood development. It’s consistent enough to show up in population data, but not large enough that you’d notice it comparing two individual children.
What’s Worth Watching For
A child who hasn’t lost any teeth by age 8, or who loses a tooth before age 4 without an obvious cause like an injury, falls outside the typical range. The same goes for a pattern where teeth on one side of the mouth are shedding normally while the other side lags significantly behind. Pain, swelling, or a tooth that turns dark after an impact are also signs that something beyond normal exfoliation is happening. In most cases, though, the process takes care of itself. The body is remarkably efficient at clearing the way for permanent teeth, even when the timing doesn’t match the textbook perfectly.