Most children lose their last baby tooth around age 12, though the full range spans from about 10 to 13. The process starts years earlier, usually around age 6, and follows a predictable pattern from front teeth to back teeth over the course of roughly six years.
The General Timeline
Children are born with 20 baby teeth (also called primary teeth), which begin erupting around 6 months of age. Those same teeth start falling out in a specific sequence beginning around age 6 and finishing, for most kids, by age 12 or 13. The Mayo Clinic notes that by age 13, most children have all their adult teeth in place.
That said, there’s a wide window of normal. Some children lose their first tooth at 4 or 5, while others don’t start until 7. The same variability applies at the end of the process. A child who started losing teeth early will often finish early, and a late starter may not lose the last baby tooth until 13 or even 14.
Which Teeth Fall Out First and Last
Baby teeth fall out in roughly the same order they came in. The sequence generally follows this pattern:
- Lower central incisors (bottom front teeth): first to go, typically around age 6 to 7
- Upper central incisors (top front teeth): follow shortly after, around age 6 to 7
- Lateral incisors (teeth flanking the front ones): around age 7 to 8
- First molars: around age 9 to 11
- Canines (the pointed teeth): around age 9 to 12
- Second molars (the back baby teeth): around age 10 to 12
The last baby teeth to go are almost always the second molars or the canines, both of which tend to fall out between ages 10 and 12. Upper canines are particularly common stragglers.
Why Baby Teeth Fall Out
Baby teeth don’t just loosen on their own. The permanent tooth growing underneath gradually dissolves the root of the baby tooth above it. Cells in the tissue surrounding the developing permanent tooth release signaling molecules that trigger this root breakdown, using the same biological process the body uses to remodel bone throughout life. As the root dissolves, the baby tooth loses its anchor and becomes progressively looser until it falls out or is easily wiggled free.
This is why a baby tooth with no permanent tooth behind it can sometimes stay in place for years. Without that dissolving signal from below, the root stays intact and the tooth holds firm. In rare cases, people retain a baby tooth well into adulthood because the corresponding permanent tooth never developed.
What Happens After the Last Baby Tooth
Losing the last baby tooth doesn’t mean your child’s mouth is done changing. The second permanent molars, sometimes called the “12-year molars,” typically come in between ages 11 and 13. These don’t replace any baby teeth. They erupt behind the existing molars into space that wasn’t previously occupied. Wisdom teeth, if they develop, usually appear between ages 17 and 25.
When Timing Is Off
Losing baby teeth too early or too late can both create issues, though neither is automatically a problem.
Losing Teeth Too Early
If a baby tooth falls out or is knocked out well before the permanent tooth is ready to come in, the surrounding teeth can drift into the empty space. This crowding can force the permanent tooth to come in crooked, get stuck beneath the gum, or erupt in the wrong position. Dentists sometimes place a small device called a space maintainer to hold the gap open until the permanent tooth is ready. Premature tooth loss from decay is one of the most common reasons kids end up needing orthodontic work later.
Losing Teeth Too Late
A baby tooth that’s still firmly in place past age 13 or 14 is worth having a dentist evaluate with an X-ray. In most cases, the permanent tooth is just delayed and will come in on its own. Occasionally, the permanent tooth is impacted (stuck in the jawbone) or was never there to begin with. A missing permanent tooth is more common than most people realize, affecting roughly 2 to 8 percent of the population, most often the upper lateral incisors or the lower second premolars.
Factors That Affect Timing
Girls tend to lose their baby teeth slightly earlier than boys, consistent with the pattern of girls reaching developmental milestones sooner on average. Genetics plays a significant role: if you lost your teeth early or late, your child likely will too. Nutrition and overall health can also influence the timeline, though their effect is smaller than genetics in most cases.
The age a child got their first baby tooth is a reasonable, if imperfect, predictor. Children who teethed early as infants often start losing teeth earlier as well. But the correlation isn’t exact, and a perfectly healthy child can fall well outside the “average” timeline without anything being wrong.