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Anodontia is a complete lack of tooth development. It is rare, most often occurring in a condition called hypohidrotic ectodermal dysplasia. Hypodontia is a lack of some tooth development (not including third molars). It is one of the most common developmental abnormalities, affecting 3.5–8.0% of the population.
Teething is the process by which an infant's first teeth (the deciduous teeth, often called "baby teeth" or "milk teeth") appear by emerging through the gums, typically arriving in pairs. The mandibular central incisors are the first primary teeth to erupt, usually between 6 and 10 months of age and usually causes discomfort and pain to the infant.
The Sri Lanka, tradition is to throw the baby teeth onto the roof or a tree in the presence of an Indian palm squirrel. The child then tells the squirrel to take the old tooth in return for a new one. In some parts of India, young children offer their discarded baby teeth to the sun, sometimes wrapped in a tiny rag of cotton turf.
There are 20 primary teeth and they typically erupt in the following order: (1) central incisor, (2) lateral incisor, (3) first molar, (4) canine, and (5) second molar. [13] As a general rule, four teeth erupt for every six months of life, mandibular teeth erupt before maxillary teeth, and teeth erupt sooner in females than males. [14]
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Radiograph of lower right third, second, and first molars in different stages of development. Tooth development is the complex process by which teeth form from embryonic cells, grow, and erupt into the mouth. Although many diverse species have teeth, their development is largely the same as
[4] The first set of teeth, or the lower central incisors, does not begin to appear until the infant is approximately six-and-a-half months old. The rest of the baby teeth, which are called deciduous teeth, will then appear “fairly consistently across the species”, until the child is about two-years-old, when the second upper molars appear ...
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