Eruption Chronology & Anomalies
Primary Dentition
The first primary tooth is usually the mandibular central incisor (~6 months); the primary dentition is typically complete by ~2.5-3 years.
Permanent Dentition
The first permanent tooth is usually the mandibular first molar (~6 years) — the '6-year molar'. Eruption generally follows a defined sequence per arch.
Eruption Anomalies
- Natal teeth — present at birth.
- Neonatal teeth — erupt within the first 30 days.
- Also: ankylosed/submerged primary molars, ectopic eruption, delayed eruption.
Exam Tips ⭐
First primary = mandibular central incisor (~6 mo); first permanent = mandibular first molar (~6 yr); natal at birth, neonatal within 30 days.
📝 Practice MCQs — Eruption Chronology & Anomalies
Q1. The first primary tooth to erupt is usually the:
A. Maxillary central incisor
B. Mandibular central incisor
C. Mandibular first molar
D. Canine
Show Answer
✅ Answer: B
The mandibular central incisor erupts first (~6 months).
Q2. The first permanent tooth to erupt is the:
A. Maxillary incisor
B. Mandibular first molar
C. Mandibular canine
D. Second molar
Show Answer
✅ Answer: B
The mandibular first molar (6-year molar) erupts first.
Q3. Teeth present at birth are called:
A. Neonatal teeth
B. Natal teeth
C. Hutchinson teeth
D. Turner teeth
Show Answer
✅ Answer: B
Natal teeth are present at birth; neonatal erupt within 30 days.
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