The eruption of baby teeth, also known as primary or deciduous teeth, is a long process that can take several years to complete. Children are not born with teeth – their first teeth begin to erupt around 6 months of age and the full set of 20 baby teeth typically finishes erupting around age 3. But why does it take so long for all of the baby teeth to erupt? There are several factors that influence the timing and order of eruption.

Timing of Baby Tooth Eruption

Timing of Baby Tooth Eruption

The eruption timeline varies from child to child, but generally the first baby tooth emerges around 6 months. After that, teeth tend to erupt in pairs, with the lower front teeth erupting first followed by upper front teeth. Here is a general timeline for baby tooth eruption:

6-10 months

  • Lower central incisors

8-12 months

  • Upper central incisors
  • Lower lateral incisors

9-13 months

  • Upper lateral incisors

14-18 months

  • First molars

16-22 months

  • Lower canines
  • Upper canines

17-23 months

  • Second molars

So as you can see, it takes around 2.5-3 years for all 20 baby teeth to finish erupting. The entire process is gradual with teeth emerging over a period of months and years.

Factors Influencing Eruption Timeline

Factors Influencing Eruption Timeline

There are several key factors that influence the eruption timeline for baby teeth:


Genetics play a major role in determining when teeth erupt. The timing is pre-programmed in each child. If parents experienced late or early eruption, the child may follow a similar pattern.


Adequate nutrition is important for healthy tooth development and eruption. Deficiencies in certain vitamins and minerals like vitamin D, calcium, and phosphorus can delay eruption.

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Health status

Chronic health conditions, childhood illnesses, or medications can affect eruption. Poor health may delay the process.

Teeth formation

The timing of calcification and maturity of the tooth root affects when eruption occurs. Teeth need to form completely under the gums first before erupting.

Oral factors

Lack of space due to crowding or premature loss of deciduous teeth can delay permanent teeth from erupting on schedule.

The Eruption Process

The lengthy eruption process for baby teeth has to do with the intricate changes that must occur as teeth transition from development to emergence in the mouth.

Tooth development

Teeth begin to form in utero before birth. Tooth development happens in several distinct stages as cells, tissues, and structures develop that will eventually make up the mature tooth. The process of teeth development continues during infancy and early childhood.

Root formation

Roots must become fully formed and calcified before eruption can occur. Root formation begins when the crown of the tooth is complete. It’s a gradual process that takes months to years depending on the tooth. Molars have two or three roots making development longer.

Tooth eruption pathway

Teeth follow a pathway as they erupt through the gums. This involves bone remodeling as the tooth “burns” a passage from the jawbone up toward the gum line. Dissolving bony tissue allows the tooth to slowly emerge.

Eruption timing

Each tooth has its own eruption timing coded in its cells. The eruption sequence is precisely scheduled to allow ideal spacing and occlusion as the jaw grows. Early removal can disrupt this predetermined timeline.

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As you can see, there are a lot of intricate developmental steps that must happen before teeth erupt. Rushing the process would be problematic, so nature times eruption carefully.

Potential Problems with Delayed Eruption

Potential Problems with Delayed Eruption

While genetics mainly drives eruption timing, delayed emergence of baby teeth can be a concern. Here are some potential issues:

  • Tooth decay – Delayed teeth may erupt in a misaligned way and be prone to plaque accumulation and cavities.
  • Malocclusion – Late eruption can allow harmful oral habits that may cause bite problems.
  • Speech difficulties – Certain speech sounds may be difficult without erupted front teeth.
  • Gum disease – Gums may become irritated without the stimulation of emerging teeth.
  • Impaction – Delayed baby teeth can potentially become impacted under the gums.

If a child is past age 3 with multiple missing teeth, see a pediatric dentist. They can monitor development and check for issues like impaction.

Supporting Healthy Eruption

While genetics dictates most of the eruption timeline, there are some things parents can do to support the process:

  • Provide a healthy pregnancy and start prenatal vitamins early
  • Ensure the child receives proper nutrition
  • Give supplemental fluoride, especially for teeth erupting earliest
  • Practice good infant oral hygiene once teeth erupt
  • Avoid certain medications that cause gingival enlargement
  • Visit a dentist by age 1 to monitor tooth development

Proper care from the start helps set children up with healthy, strong baby teeth. Even if eruption takes years, parents can keep teeth developing well until the long-awaited emergence.

Frequently Asked Questions

When do baby teeth start coming in?

The timing varies, but most babies get their first tooth around 6 months of age. The very first teeth to erupt are usually the lower central incisors.

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Do baby teeth erupt in order?

Yes, baby teeth tend to emerge in a somewhat predictable sequence over 2-3 years. The lower front teeth come in first, followed by upper front teeth, first molars, canines and second molars.

What problems are caused by delayed eruption?

Delayed eruption of baby teeth can potentially lead to issues like tooth decay, malocclusion, speech difficulties, gum disease and tooth impaction. Seeing a dentist is recommended if a child is older than 3 with many missing teeth.

How can I help my baby’s teeth erupt on schedule?

While the schedule is mostly genetic, make sure your child has adequate nutrition, proper fluoride exposure, good infant oral hygiene once teeth erupt, and early dental exams to monitor development.

When should I take my child to the dentist?

The latest guidelines recommend a first dental visit by 12 months old, sometimes earlier if teeth erupt sooner. Early visits help the dentist check for problems and teach good oral hygiene before decay can occur.

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