Dentition whether or not it has erupted. Regarding premolars, there is disagreement regarding whether the third type of deciduous tooth is a premolar (the general consensus among mammalogists) or a molar (commonly held among human anatomists). There is thus some discrepancy between nomenclature in zoology and in dentistry. This is because the terms of human dentistry, which have generally prevailed over time, have not included mammalian dental evolutionary theory. There were originally four premolars in each quadrant of early mammalian jaws. However, all living primates have lost at least the first premolar. "Hence most of the prosimians and platyrrhines have three
U Should've Known Better successful on "Billboard"´s component charts. It reached number 6 on the Hot R&B/Hip-Hop Singles & Tracks—Monica's tenth non-consecutive top ten entry on that particular chart—as well as the top ten on the Hot R&B/Hip-Hop Airplay and the top twenty on the Hot 100 Airplay chart. It also appeared on the Rhythmic Top 40 at number 20. The song was ranked 72nd on the Hot R&B/Hip-Hop Singles 2004 year-end chart. The music video for "U Should've Known Better" was shot by director Benny Boom, and produced by Joyce Washington for FM Rocks. It was filmed in various locations throughout Mexico, in