A typical 6-year-old has around 20 to 24 teeth, depending on where they are in the transition from baby teeth to permanent ones. At this age, children enter what dentists call “mixed dentition,” a phase lasting roughly from age 6 to 11 where both baby and adult teeth share space in the mouth. Some 6-year-olds still have all 20 of their original baby teeth, while others have already lost a couple and gained their first permanent molars.
The Starting Point: 20 Baby Teeth
Children typically have a full set of 20 baby teeth by age 3. That set includes eight incisors (the flat front teeth), four canines (the pointed ones), and eight molars (the wider chewing teeth in the back). Many kids enter their sixth year with all 20 still in place, especially early in the year.
What Changes at Age 6
Two big things happen around a child’s sixth birthday, often within months of each other. First, baby teeth start to get loose and fall out. The first to go are almost always the two bottom front teeth (the lower central incisors), followed by the two top front teeth. Second, four brand-new permanent molars begin pushing through the gums behind the last baby teeth, two on top and two on the bottom. These are commonly called “6-year molars.”
Because these molars erupt in empty space at the back of the jaw rather than replacing a baby tooth, a child who hasn’t lost any baby teeth yet but has all four 6-year molars will temporarily have 24 teeth. A child who has lost two bottom front teeth but gained two molars so far might have 20. The exact count shifts throughout the year as teeth fall out and grow in on their own schedule.
Why Every Child’s Count Is Different
There’s no single “correct” number of teeth for a 6-year-old because the timing of tooth loss and eruption varies widely. Some children lose their first tooth at 5, others not until 7. Several factors influence this timing:
- Pace of permanent tooth development. The adult tooth beneath the gum may simply be forming more slowly, which delays the loosening of the baby tooth above it.
- Crowding or misalignment. When there isn’t enough room in the jaw, permanent teeth can struggle to push baby teeth out on schedule.
- Missing permanent teeth. In rare cases, a permanent tooth never develops at all, so the baby tooth stays put with nothing to replace it.
- Past injury or infection. Trauma to the mouth or a previous dental infection can affect how and when teeth come in.
A child who still has all 20 baby teeth at 6 and a half is not necessarily behind. Variation of a year or more in either direction is normal.
The 6-Year Molars Deserve Extra Attention
The first permanent molars are easy to overlook because they appear quietly in the back of the mouth without a baby tooth falling out first. But they’re among the most cavity-prone teeth a child will ever have. Their chewing surfaces are full of deep grooves where food and bacteria collect, and they arrive at an age when many kids are still developing their brushing skills.
Dental sealants, a thin protective coating painted onto the chewing surface, prevent about 80% of cavities in back teeth. Many dentists recommend applying sealants to the 6-year molars shortly after they fully emerge. It’s a quick, painless process that can save a tooth that needs to last a lifetime.
What to Expect Over the Next Few Years
After the lower and upper front teeth fall out and regrow as permanent teeth, the lateral incisors (the teeth on either side of the front ones) are next in line, typically between ages 7 and 8. Then come the first baby molars, canines, and finally the second baby molars, with most children finishing the process by 12 or 13. By the end, your child will have 28 permanent teeth, with the four wisdom teeth arriving much later in the teen years or early twenties.
During the mixed dentition phase, it’s common for new adult teeth to look oversized compared to the remaining baby teeth, or for gaps to appear as baby teeth fall out before the permanent replacements are ready. Both are a normal part of the transition. The mouth gradually catches up as the jaw grows and the remaining adult teeth fill in.