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The Tooth Eruption Date Calculator predicts when specific primary (baby) and permanent (adult) teeth are expected to erupt based on the child's age, tooth type, and jaw location. Understanding normal eruption timing helps parents and dentists identify potential developmental issues early.
Tooth eruption follows a remarkably predictable sequence, though the exact timing can vary by several months between individuals. Primary teeth (20 total) begin erupting around 6-8 months of age, with the lower central incisors typically appearing first. The complete primary dentition is usually present by age 2.5-3 years. These baby teeth serve crucial roles in nutrition, speech development, and maintaining space for permanent teeth.
Permanent teeth (32 total including wisdom teeth) begin replacing primary teeth around age 6, starting with the first permanent molars (the 6-year molars) and lower central incisors. The transition from primary to permanent dentition (mixed dentition phase) lasts from approximately age 6 to 12. Third molars (wisdom teeth) typically emerge between ages 17-21, though they may be congenitally absent in about 20% of the population.
The eruption sequence is generally more reliable than the exact timing. For primary teeth, the typical sequence is: central incisors → lateral incisors → first molars → canines → second molars. For permanent teeth: first molars → central incisors → lateral incisors → first premolars → canines → second premolars → second molars → third molars. Lower teeth generally erupt before their upper counterparts (except for premolars).
Several factors can affect eruption timing: genetics (the most significant factor), sex (girls generally erupt earlier than boys), nutrition, ethnicity, systemic conditions (hypothyroidism, growth hormone deficiency, Down syndrome can delay eruption), and local factors (supernumerary teeth, cysts, ankylosis). Premature loss of primary teeth can cause space loss and affect permanent tooth eruption.
This calculator provides standard eruption ages based on published dental development charts, helping parents understand what to expect and when to consult a dentist if teeth are significantly early or delayed.
The calculator uses standard eruption timetables from the American Dental Association:
The Eruption Age shows when this tooth typically appears. Months Until indicates expected waiting time. If Expected to Have Erupted is 1 but the tooth has not appeared, a delay of 6-12 months beyond the average is generally normal. Consult a dentist if eruption is delayed by more than 12 months, if teeth erupt in an unusual order, or if primary teeth have not appeared by 15 months of age. Remember that these are averages — individual variation is normal and expected.
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Upper central incisors typically erupt at 10 months. At 12 months, this tooth should already have erupted. Normal and expected.
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First permanent molars erupt around 78 months (6.5 years). At age 5 (60 months), expect this tooth in about 18 months.
Most babies get their first tooth between 6-10 months, typically the lower central incisors. However, the range is wide — some babies are born with teeth (natal teeth), while others do not get their first tooth until 14-15 months. Both extremes are usually normal.
The typical order is: lower central incisors (6-10mo), upper central incisors (8-12mo), upper lateral incisors (9-13mo), lower lateral incisors (10-16mo), first molars (13-19mo), canines (16-23mo), second molars (23-33mo). Variation in sequence is common and usually not concerning.
Primary teeth are shed in approximately the same order they erupted. Lower central incisors are lost around age 6-7, followed by the rest. The last baby teeth (second molars and canines) are typically lost by age 11-13. Girls generally lose teeth earlier than boys.
The first permanent molars erupt around age 6, behind the last baby teeth. They do NOT replace any baby tooth — they are additional teeth. They are among the most cavity-prone teeth because they erupt before good oral hygiene habits are established. Sealants are highly recommended.
Slight delays (a few months) are completely normal. Consult a dentist if: no teeth by 15 months, teeth erupt in a very unusual order, or permanent teeth are more than 12 months behind schedule. Delayed eruption can occasionally indicate systemic conditions.
Yes, girls generally erupt both primary and permanent teeth earlier than boys by an average of 1-6 months. This parallels the general trend that girls reach developmental milestones slightly earlier than boys.
Causes include: genetics (most common), hypothyroidism, growth hormone deficiency, Down syndrome, nutritional deficiencies, premature birth, local obstruction (extra teeth, cysts), and ankylosis (fusion of tooth to bone). Most delayed eruption is a normal variant.
Third molars (wisdom teeth) typically emerge between ages 17-21. About 20-25% of people are congenitally missing one or more wisdom teeth. Impacted wisdom teeth (unable to fully erupt) are very common and may require extraction if they cause pain, infection, or damage to adjacent teeth.
Studies show that teething may cause mild irritability, drooling, gum rubbing, and slightly elevated temperature (not a true fever). Temperatures above 100.4°F (38°C), diarrhea, and rashes are NOT caused by teething and should be evaluated by a pediatrician.
The ADA and AAPD recommend a first dental visit by age 1 (or within 6 months of the first tooth). Early visits establish a dental home, provide anticipatory guidance on diet and hygiene, and allow early detection of problems like early childhood caries.
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