5 Differences between Milk teeth and Permanent teeth

Humans dentition is described as thecodont, heterodont and diphyodont. 
  • Thecodont: Teeth are placed in the socket of jaw bones
  • Heterodont : teeth are four different types both in structure and function
  • Diphyodont: Teeth appear twice in the life time of human. They are milk teeth and permanent teeth.
These teeth are present in both jaws socket i.e., the fixed upper jaw and movable lower jaw of maxilla and mandible bone respectively. 
They have two successive sets of teeth: milk teeth (Baby teeth) and Permanent teeth.
Milk teeth vs Permanent teeth
Milk teeth ( Deciduous teeth)
Permanent teeth
Start erupting after 6 months of birth and appear between 6 to 24 months
Begin to replace milk teeth in the 6 th year  of age and usually completed by 24 years
Smaller, weaker and temporary
Stronger and permanent
3 types (incisor, canine and molars)
8 incisors + 4 canines + 8 molars
4 types (incisor, canine premolars and molars)
8 incisor+ 4 canine+ 8 premolars + 12 molars
20 in number, 10 each in the upper and lower jaw
32 in number, 16 each in the upper and lower jaw
Dental formula of milk teeth 2102
Dental formula of permanent teeth 2123
Dental formula: Each mammalian species is characterized by its own specific dentition with a definite number and arrangement of teeth. It is expressed in dental formula.
  • An adult human being has 16 teeth on each jaw. In each half of jaws starting from the middle and going backwards, there are two incisors, one canine, two premolars and three molars (2+1+2+3).
  • Dental formula of Milk teeth: 20 in number (2+1+0+2)  
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