The upper premolars are larger, and present a greater tendency to the division of their roots than the lower; this is especially the case in the first upper premolar.
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Alphadon (marsupials can be distinguished from placentals by their dentition - marsupials have 3 premolars and 4 molars whilst placentals have 3-5 premolars and 3 molars).
dental formula A notation that indicates the number of incisors, canines, premolars, and molars in the upper and lower jaw of a mammal.
denticle A small toothlike process.
denticles (denticulate) Small, toothlike projections.
 See also: Trans, Vision, Skin, Life, Differentiation
  
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