Dental Eruption Patterns
| Primary Tooth Eruption Pattern (The Rule of 4) | ||
|---|---|---|
| Age in Months | Number of Teeth | Erupting Teeth |
| 8 months | 4 | Central Incisors |
| 12 months | 8 | Lateral Incisors |
| 16 months | 12 | First Molars |
| 20 months | 16 | Canines |
| 24 months | 20 | Second Molars |
| Permanent Tooth Eruption Patterns | ||
|---|---|---|
| Age in Years | Maxillary | Mandibular |
| 6-7 | 1st Molars (1) | |
| 6-7 | 1st Molars (1a) | |
| 6-7 | Cental Incisors (2) | |
| 7-8 | Central Incisors (3) | |
| 7-8 | Lateral Incisors (4) | |
| 8-9 | Lateral Incisors (5) | |
| 9-11 | Canines (6) | |
| 10-11 | 1st Premolars (7) | |
| 10-12 | 1st Premolars (8) | |
| 10-12 | 2nd Premolars (9) | |
| 11-13 | 2nd Premolars (10) | |
| 11-12 | Canines (11) | |
| 12-14 | 2nd Molars (12) | 2nd Molars (12a) |
| 17-30 | 3rd Molars (13) | 3rd Molars (13a) |
Figures in parentheses indicate order of eruption. Many otherwise healthy kids do not confrom strictly to the stated schedule.
References
American Academy of Pediatric Dentistry. Dental Growth and Development. The Reference Manual of Pediatric Dentistry. Chicago, IL: American Academy of Pediatric Dentistry; 2021: 553.