There are two large upper primary incisor teeth and a secondary set of small incisors located behind them, called peg teeth. The upper incisor teeth have a single deep longitudinal groove as well ...

In 1850, it’s estimated it took 75 to 90 labor hours to produce 100 bushels of corn, and that would take 2.5 to 3 acres. By 1890, that reduced to 35 to 40 labor hours to produce the same 100 bushels, ...

Behind the upper primary set of incisors is a small set of secondary incisors often referred to as the peg teeth. The two lower incisors rest behind the upper primary incisors and occlude with the ...