Children have 20 baby teeth, also called primary teeth. These 20 teeth include 10 on the top jaw and 10 on the bottom, and most kids have the full set in place by age 2½ to 3. That number eventually grows to 32 permanent teeth by the time they reach their teens.
The 20 Baby Teeth, Broken Down
Each jaw holds the same arrangement of 10 teeth: four incisors (the flat front teeth used for biting), two canines (the pointy ones next to the incisors), and four molars (the wider teeth in the back for grinding food). In total, that gives your child 8 incisors, 4 canines, and 8 molars across both jaws.
One notable difference from the adult set: baby teeth have no premolars. Adults have 8 premolars that sit between the canines and molars, plus an extra set of molars (the wisdom teeth) in the very back. Those additional 12 teeth are what bring the adult total from 20 up to 32.
When Baby Teeth Come In
The first teeth usually break through the gums between 6 and 12 months of age. The lower front teeth (central incisors) tend to appear first, followed by the upper front teeth. From there, teeth continue to arrive in pairs over the next couple of years, with the molars filling in last. By around age 3, most children have all 20 teeth in place.
Teething timelines vary quite a bit from child to child. Some babies sprout their first tooth closer to 4 months, while others don’t see one until after their first birthday. Both ends of that range are perfectly normal. What stays consistent is the general order: front teeth first, then outward toward the back.
When Kids Start Losing Teeth
Baby teeth begin falling out around age 6, though some children don’t start until age 7. The teeth tend to leave in roughly the same order they arrived. The two bottom front teeth loosen first, followed by the two top front teeth. After that, the lateral incisors go, then the first molars, canines, and finally the second molars. By age 13, most children have lost all their baby teeth and have a full set of permanent teeth in place.
The complete primary set typically stays intact from around age 3 to age 6 or 7, giving kids several years with a stable set of teeth before the transition begins.
Why Baby Teeth Matter More Than You’d Think
It’s easy to assume baby teeth are disposable since they fall out anyway, but they serve functions that affect your child’s development well beyond chewing. Primary teeth hold space in the jaw for the permanent teeth growing underneath. When a baby tooth is lost too early, whether from decay or injury, neighboring teeth can drift into the gap and block the permanent tooth from coming in straight. This is one of the most common causes of crowding that later requires orthodontic treatment.
Baby teeth also play a direct role in speech development. Children who lose teeth early due to decay can have trouble producing sounds like “th” and “la,” and in some cases the speech patterns they develop as a workaround persist long enough to require therapy. The American Academy of Pediatric Dentistry recommends a first dental visit by age one, right as teeth begin emerging, so potential problems can be caught before they cause lasting issues.
Can Kids Have More or Fewer Than 20?
Most children end up with exactly 20 primary teeth, but variations do occur. Some kids develop extra teeth, a condition called hyperdontia, while others are missing one or more teeth from birth, known as hypodontia. Extra teeth are more common than missing ones. The prevalence varies across different populations, and boys are slightly more likely than girls to develop extra teeth.
If your child seems to have an unusual number of teeth, a dental X-ray can confirm what’s present and what’s developing below the gumline. An extra or missing baby tooth doesn’t necessarily mean the permanent teeth will follow the same pattern, but it’s worth tracking so your dentist can plan ahead for the transition.
The Jump From 20 to 32
As permanent teeth replace baby teeth starting around age 6, additional teeth also begin appearing in spots where no baby tooth existed. The first permanent molars, sometimes called “six-year molars,” erupt behind the last baby teeth without replacing anything. Later, the premolars emerge in the spaces left by the baby molars, and a second set of permanent molars arrives around age 12. Wisdom teeth, the third molars, typically show up between ages 17 and 21, bringing the maximum adult count to 32.
Not everyone gets all 32. Wisdom teeth are increasingly common to be missing entirely, and many people have them removed before they fully emerge. A functional adult set without wisdom teeth is 28 teeth, which is perfectly sufficient.