Describe the following 1)Thecodont 2)Diphyodont 3)Decidious teeth 4)Hetrodont 5)Dental Formula.

Dear Student,
 

Thecodont is a type of dentition in which the teeth are embedded in the deep sockets of the jaw bone. Ankylosis is absent and the roots are cylindrical.

Examples include living crocodilians and mammals.

Diphyodont is a type of dentition in which two successive sets of teeth are developed during the lifetime of the organism. The first set of teeth is deciduous and the other set is permanent.

The deciduous set of teeth is replaced by the permanent adult teeth.
This type of dentition can be seen in humans.

Heterodont
1. Animal whose teeth differ morphologically are said to be heterodont.
2. For example: Most mammals like man, dog generally possess incisors, canines, premolar and molar.
 

Dental formula

The dental formula expresses the arrangement of teeth in each half of the upper jaw and the lower jaw. The entire formula is multiplied by two to express the total number of teeth.

For example:
The dental formula for milk teeth in humans is: 

Each half of the upper jaw and the lower jaw has 2 incisors, 1 canine, and 2 molars. Premolars are absent in milk teeth.

The dental formula for permanent teeth in humans is: 

Each half of the upper jaw and the lower jaw has 2 incisors, 1 canine, 2 premolars, and 3 molars. An adult human has 32 permanent teeth






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