Dental Age Calculator (Tooth Eruption Check)
This tool compares the teeth your child has with the American Dental Association eruption charts, using your child's exact age in months. It lists any tooth that came through before the chart's usual range and any that hasn't appeared after it. It does not work out a clinical "dental age" — dentists do that from X-rays, using methods such as Demirjian's.
Before you start
Method : Your ticks compared with the ADA eruption chart ranges at your child's exact age. No single dental age is calculated.
Validation : Chart values copied from the ADA PDFs. The comparison rule is ours and is not a validated dental age method.
Review : not reviewed by a qualified clinician. Educational only — not a diagnosis or a medical test.
For children and teenagers. A real dental age needs X-rays and a dentist.
Your answers stay in this browser tab; nothing is sent or stored.
Enter a date of birth and tick the teeth that have come through.
How to Use This Calculator
- Enter the date of birth.
- Tick each tooth that has come through (one side is enough).
- Press Compare with chart.
Methodology & assumptions
Age is counted in completed calendar months. Each ADA range is read inclusively: "8–12 months" covers ages from 8 completed months up to 12 completed months; "7–8 years" covers from the 7th birthday through the month before the 9th. A ticked tooth is listed as early if the child is younger than its range; an unticked tooth is listed as not yet through if the child is past its range. Baby teeth aren't checked after age 6, when they start to fall out.
Worked examples
Child aged 1 year 2 months (14 months), with lower and upper central incisors only: both are within range; lower lateral incisor (10–16 months) is fine; upper lateral incisor (9–13 months) is listed as not yet through.
Child aged 5 years 6 months with a lower first adult molar: listed as earlier than the chart range (6–7 years) — usually just normal variation.
Understanding your result
The ADA chart shows typical ranges, not limits. Being outside them is common and often normal. This check is not validated as a dental age method and can't diagnose anything; a dentist is the right person to judge development.
Sources & further reading
Frequently Asked Questions
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