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first molar

   Also found in: Wikipedia 0.01 sec.
first molar
n.
The sixth permanent tooth or fourth deciduous tooth in the upper and lower jaw on either side.


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Because the fetus's first molars are well-mineralized, Gingerich and his colleagues suggest that Maiacetus young were precocial, or able to supplement their mother's milk with other food sources soon after birth, as are all of today's marine mammals.
In the new study, it was found that turning off a single gene in mice resulted in development of extra teeth, next to and inside of their first molars.
The first deciduous or 'milk teeth' to go are usually the first molars, then it will take several more years for all of the first teeth to be replaced with the adult or 'permanent' set, which is complete by about the age of 13 except for the final molars at the back, the 'wisdom teeth', which take longer.
 
 
 
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