Which tooth is first to erupt in lower jaw is?

Ans. is 'a' i.e., Central incisor First temporary tooth to appear (in primary dentition) is lower central incisors and last temporary tooth to erupt is 2nd molar.The sequence of eruption is lower central incisor > upper central incisor > upper lateral incisor > lower lateral incisor > 1st molar > Canine > 2nd molar.Therefore eurption of temporary teeth is completed by eruption of 2nd molar at 25 months (2 years).