Children have 20 primary teeth, also called baby teeth. These start forming before birth and usually begin erupting through the gums around 6 months of age. The full set of 20 is typically in place by about age 3. Adults have 32 teeth, including wisdom teeth, which is why the count changes so much over a childhood.
That simple number hides a lot of variation. The timing of each tooth, the order they appear, and when they fall out can differ widely from child to child and still be completely normal. This guide walks through the whole timeline, what each stage means, and when a delay is worth mentioning to a dentist.
How Many Teeth Do Children Have Compared to Adults?
Children have 20 primary teeth. Adults have 32 permanent teeth. The difference comes down to jaw size and the job each set does.
A young child’s jaw is small. Twenty teeth fit comfortably and handle a diet that is mostly soft or moderately chewed food. As the face and jaw grow through childhood and adolescence, there is room for 32 permanent teeth, including the four wisdom teeth at the very back.
Here is how the 20 primary teeth break down:
- 8 incisors — four on top, four on the bottom, used for biting
- 4 canine teeth — one in each corner, used for tearing
- 8 molars — four on top, four on the bottom, used for grinding
Notice what is missing: there are no premolars in the primary set. Premolars are permanent teeth that appear later, between the primary molars and the canines. This is one of the most common points of confusion. A parent counting a child’s teeth may expect the same layout as their own mouth and come up short. The primary set simply has a different structure.
The permanent set adds 12 more teeth: 8 premolars and 4 wisdom teeth. That brings the total from 20 to 32. Not everyone ends up with all four wisdom teeth. Many people have some or all of them removed, and some people never develop them at all.
When Do Baby Teeth Come In?
Primary teeth usually begin erupting at around 6 months, though the range is broad. Some babies get their first tooth at 4 months. Others are still toothless past their first birthday. Both can be normal.
Teeth tend to arrive in a fairly predictable order, even when the timing varies:
- 6 to 10 months: the lower central incisors, the two front bottom teeth, are usually first
- 8 to 12 months: the upper central incisors follow
- 9 to 16 months: the upper and lower side incisors
- 13 to 19 months: the first molars, which sit further back and often cause more discomfort
- 16 to 23 months: the canines
- 23 to 33 months: the second molars
By about age 3, most children have all 20 primary teeth. Girls often teethe slightly earlier than boys, and there is a genetic component — if you or your partner teethed late, your child may too.
Teething itself is real, but the symptoms are often overstated. Mild gum discomfort, irritability, and increased drooling are common. High fever and significant diarrhea are not typical teething symptoms. If a baby has a fever above 100.4°F (38°C) or seems genuinely unwell, that deserves a call to a pediatrician rather than being written off as teething.
When Do Children Start Losing Teeth?
Children usually start losing primary teeth around age 6. The lower central incisors are typically the first to go, followed by the upper front teeth. Most children have a noticeable gap-toothed phase between ages 6 and 8.
The loss continues in roughly the same order the teeth arrived. Front teeth go first, then the side incisors, then the first molars and canines. The second molars are usually the last primary teeth to fall out, often between ages 10 and 12.
By around age 12 to 13, most children have lost all 20 primary teeth and have a full set of 28 permanent teeth. The wisdom teeth, if they develop, typically appear much later — often in the late teens or early twenties.
One detail worth knowing: the roots of a baby tooth dissolve before it falls out. That is why a loose tooth can hang on by what feels like a thread. The permanent tooth underneath is pushing up and resorbing the root. Pulling a tooth before it is ready can be painful and can occasionally cause problems, so letting it come out on its own is generally the safer approach.
What Is the Full Timeline for Children’s Teeth?
The table below summarizes the typical ages for each stage. These are general ranges, not strict rules. A child who is a few months off in either direction is usually developing normally.
| Stage | Typical Age Range |
|---|---|
| First tooth appears | 6 months (range 4–12 months) |
| Full set of 20 primary teeth | About 3 years |
| First tooth lost | About 6 years |
| First permanent molars appear | About 6 years |
| Most permanent teeth in place | 12–13 years |
| Wisdom teeth (if present) | Late teens to early twenties |
The six-year molars deserve special mention. These are permanent teeth that come in behind the last baby teeth, often around age 6. Because they arrive without a baby tooth falling out first, parents sometimes mistake them for baby teeth and skip brushing them properly. They are permanent and need lifelong care.
What If My Child’s Teeth Are Late or Out of Order?
Most variation in teething and tooth loss is normal. A child who gets their first tooth at 10 months instead of 6 is not automatically behind. The same goes for a child who loses teeth in a slightly different order than a sibling did.
There are situations where a dentist may want to take a closer look:
- No teeth at all by 18 months
- Teeth that appear unusually discolored or misshapen
- A permanent tooth that has not come in well after the baby tooth fell out
- Teeth that are very crowded or overlapping
- Signs of decay, white spots, or dark marks on any tooth
Some children are simply late bloomers when it comes to teeth, and there is often a family pattern. In other cases, delayed eruption can be linked to nutritional issues, genetic conditions, or problems with the development of the tooth itself. A dentist can usually tell the difference with an exam and, if needed, an X-ray.
Crowding is another common concern. When permanent teeth are larger than the space available, they can come in crooked or overlap. Some crowding resolves as the jaw grows. Some does not. Orthodontic evaluation is often recommended around age 7, when a dentist can assess how the bite and jaw are developing, though not every child needs treatment at that age.
How Should You Care for Children’s Teeth at Each Stage?
Dental care starts before the first tooth appears. Wiping a baby’s gums with a soft, damp cloth after feeding helps remove bacteria and gets the child used to the routine.
Once teeth arrive, brushing matters. For children under 3, the general guidance is to brush with a small smear of fluoride toothpaste — roughly the size of a grain of rice. From age 3 to 6, a pea-sized amount is typical. These amounts come from widely used pediatric dental guidance, and a dentist can confirm what is right for your child.
A few practical points:
- Brush twice a day, with the last brushing right before bed
- Children usually need help brushing until around age 6 or 7, when their hand coordination improves
- Fluoride toothpaste is recommended by major dental and pediatric organizations because it strengthens enamel and reduces decay
- A first dental visit is generally recommended by the child’s first birthday or within six months of the first tooth appearing
Diet plays a large role too. Frequent sugary snacks and drinks — including juice and sweetened milk — keep teeth bathed in acid that erodes enamel. Water is the safest everyday drink for teeth.
One point that surprises many parents: baby teeth matter even though they fall out. Untreated decay in a primary tooth can cause pain, infection, and problems with eating and speaking. It can also affect the permanent tooth developing underneath. Primary teeth also hold space for the permanent teeth, so losing one too early can shift the alignment of what comes next.
Do All Children Have the Same Number of Teeth?
Most children have 20 primary teeth, but not every child does. Some are born with a missing tooth or teeth, a condition called hypodontia. Others have extra teeth, called hyperdontia. Both are uncommon but well documented.
The most commonly missing primary tooth is one of the lower front incisors. Extra teeth most often appear near the upper front teeth. These variations are usually found during a dental exam or on an X-ray.
Having one fewer or one extra tooth does not automatically mean something is wrong. It does mean a dentist should monitor how the bite and spacing develop, especially as permanent teeth come in.
The 20-teeth figure is the standard, not a guarantee. It is the number most children reach, and it is the number that guides dental care and growth expectations.
Frequently Asked Questions
How many teeth do children have?
Children have 20 primary teeth, also called baby teeth. These are usually all in place by about age 3 and are gradually replaced by permanent teeth starting around age 6.
At what age do children stop losing baby teeth?
Most children have lost all 20 primary teeth by around age 12 to 13. The exact timing varies, and the second molars are often the last to go.
Is it normal for a 1-year-old to have no teeth?
Yes, it can be normal. Some children get their first tooth closer to 12 or even 15 months, and a dentist can check development if there is concern.
Do baby teeth really matter if they fall out anyway?
Yes. Baby teeth help with chewing, speech, and holding space for permanent teeth, and untreated decay can cause pain and infection. Caring for them protects the permanent teeth developing underneath.
