There are two sets of teeth in a person’s life, the baby teeth come in first and are gradually replaced by the permanent teeth underneath them as they get older. The eruption and replacement of milk and permanent teeth have their own time and pattern. The developmental schedule of milk teeth Name of teeth Eruption time Eruption order (serial number) Maxillary incisor: 7.5 months Lateral incisor: 9 months Cuspids: 18 months First molar: 14 months Second molar: 24 months Mandible incisor: 6 months Lateral incisor: 10 months Cuspids: 16 months First molar: 12 months Second molar: 20 months The developmental schedule of permanent teeth Name of teeth Eruption time Eruption order Order (serial number) Maxillary Incisors: 7-8 years Lateral incisors: 8-9 years Cuspids: 11-12 years First premolar: 10-11 years Second premolar: 10-12 years First molar: 6-7 years Second molar: 12-13 years Mandible Incisors: 6-7 years Lateral incisors: 7-8 years Cuspids: 9-10 years First premolar: 10-12 years Second premolar: 11-12 years First molars: 6-7 years Second molars: 11-13 years