Primary Teeth Types
A child's mouth, divided into the upper teeth and the lower teeth, start developing in the front of both sections with the central incisors. The lower ones come in first, anywhere from six to 10 months, whereas the upper set emerges between eight and 12 months. The central incisors tend to fall out between ages six and seven, according to the American Dental Association (ADA) Mouth Healthy site.
Adjacent to the central incisors are the lateral incisors. The upper laterals (nine to 13 months) appear before the lower laterals (10-13 months), and shed themselves between ages seven and eight. On both sides of the laterals are the canines (cuspids), and the uppers (16-22 months) come in before the lowers (17-23 months). Both sets fall out from the ages of nine to 12.
The last eight teeth to appear are the first and second molars – four of each. The upper firsts can take longer to emerge (13-19 months), whereas the lower firsts start later and finish earlier (14-18 months). Both sets shed between ages nine and 11. The second molars complete the set and arrive last: Both sets erupt right around two years of age (lower 23-31 months and upper 25-33 months) and are also the last ones to fall out between the ages of 10 and 12.