The short answer
Most children get their first baby tooth sometime around the middle of the first year, have all 20 primary teeth by about age 3, begin losing front baby teeth around age 6, and continue replacing baby teeth with permanent teeth through the school years. First permanent molars often appear around ages 6 to 7 behind the baby molars; they do not push out a baby tooth.
Those ages are useful landmarks, not deadlines. Children do not all follow the same day-by-day schedule, and different teeth have different ranges. A dentist interprets the pattern as a whole—what is present, what has been lost, how the two sides compare, and what an examination shows.
The timeline at a glance
| Broad stage | What families may notice |
|---|---|
| Around 6 months through age 3 | Primary teeth usually begin with the front teeth and appear gradually until there are 20. Some children start earlier or later. |
| Around ages 6 to 8 | Lower front baby teeth commonly loosen and are replaced. First permanent molars may erupt at the very back without replacing any baby tooth. |
| Around ages 8 to 10 | More front permanent teeth emerge. The mouth often contains a mix of primary and permanent teeth. |
| Around ages 9 to 13 | Canines, premolars, and second permanent molars generally join the arch in overlapping ranges. The exact order differs between the upper and lower jaws. |
| Later teens into early adulthood | Third molars, or wisdom teeth, may erupt, remain partly erupted, stay under the gums, or never develop. They are not part of every person’s functional eruption timeline. |
This overview intentionally uses broad bands. A tooth chart can provide a typical range for each tooth, but it cannot establish whether an individual child’s timing is healthy.
Baby teeth: the first set
Children usually have 20 primary teeth—10 upper and 10 lower. The lower front teeth often arrive first, followed by other front teeth, first molars, canines, and second molars. Most children have the full primary set by about age 3.
The order can overlap, and matching teeth do not have to appear on the same day. An age printed on a chart is a population guide, not a pass-or-fail milestone. If no teeth have appeared when a parent expected, or the pattern seems unusual, the useful next step is a dental assessment rather than trying to diagnose the cause from the calendar.
For care during this stage, see why baby teeth matter and what teething usually looks like.
The school-age transition
Around age 6, two changes may happen close together:
- front baby teeth begin to loosen and shed; and
- first permanent molars erupt behind the last baby molars.
That second change is easy to miss because no baby tooth falls out first. These permanent molars need the same daily brushing and professional prevention attention as the permanent front teeth.
As more primary teeth loosen and permanent teeth appear, the child enters mixed dentition—the years when both sets are present. Gaps, different tooth heights, and an uneven-looking sequence can occur because teeth are not exchanged all at once. Appearance alone cannot show whether there is enough space or whether every permanent tooth is developing normally.
Permanent teeth: overlapping ranges
ADA eruption charts place many permanent teeth in overlapping age ranges:
- first molars and some lower front teeth commonly erupt around ages 6 to 7;
- other front teeth commonly follow through roughly ages 7 to 9;
- canines and premolars generally emerge across roughly ages 9 to 12, with upper and lower teeth following different patterns; and
- second permanent molars commonly appear around ages 11 to 13.
These are orientation points, not a prediction for one child. A missing, blocked, unusually positioned, or delayed tooth cannot be confirmed from a chart. Dentists use the clinical history and examination—and imaging only when indicated—to understand the child’s individual development.
Why timing varies
Tooth eruption reflects development, space, the position of the developing tooth, and the status of the baby tooth above it. Normal biological variation means siblings may follow different schedules.
Timing also can be affected by local or developmental factors that require professional assessment. The AAPD’s developing-dentition guidance includes concerns such as ectopic eruption, congenitally missing or extra teeth, ankylosis, and other eruption disturbances. A family should not use that list to label a child. It explains why an examination is more informative than comparing one date with a chart.
When to ask a dentist
Bring up the pattern at a dental visit if:
- a tooth seems far outside the expected sequence or the two sides look notably different over time;
- a permanent tooth appears in an unexpected position or while the baby tooth remains firmly in place;
- a baby tooth was lost much earlier than expected;
- a tooth appears partly through and is difficult to keep clean;
- there is persistent pain, swelling, drainage, injury, or difficulty eating; or
- you simply cannot tell which tooth is coming in.
These observations do not identify a diagnosis. A dentist can determine whether the pattern is ordinary variation, something to monitor, or a finding that needs further assessment. If a baby tooth is already loose, this guide to loose baby teeth explains the no-force approach. If a baby tooth was lost early because of decay or injury, see what early baby-tooth loss can mean.
How to use an eruption chart well
Use the chart to:
- learn the general sequence;
- recognize that first permanent molars may arrive without a baby tooth falling out;
- help identify whether a tooth is probably primary or permanent; and
- prepare a specific question for the dental team.
Do not use it to:
- declare a child early, late, or abnormal from one age alone;
- predict whether there is enough room;
- decide that a retained baby tooth should be removed;
- assume a tooth is missing; or
- delay care when pain, swelling, injury, or another concerning change is present.
The takeaway
Baby and permanent teeth follow a recognizable progression, but the progression is a range—not a countdown. First baby teeth often appear around 6 months, the primary set is usually complete by about age 3, and the permanent transition commonly begins around age 6 and continues into the early teen years. Use the timeline to understand the next broad stage, and use a dental examination—not the chart alone—to interpret an individual child’s pattern.
Sources
- Eruption Charts — American Dental Association MouthHealthy
- Baby Teeth — American Dental Association MouthHealthy
- Management of the Developing Dentition and Occlusion in Pediatric Dentistry — American Academy of Pediatric Dentistry
- Periodicity of Examination, Preventive Dental Services, Anticipatory Guidance/Counseling, and Oral Treatment — American Academy of Pediatric Dentistry