<unk> , otherwise known as milk<unk> , baby<unk> , temporary<unk>  or primary<unk> , are the first set of<unk>  in the growth development of humans and many other mammals. They develop during the embryonic stage of development and erupt — that is, they become visible in the mouth — during infancy.  They are usually lost and replaced by permanent<unk> , but in the absence of permanent replacements, they can remain functional for many years.<unk>  start to form during the embryo phase of pregnancy. The development of<unk>  starts at the sixth week of  development as the dental lamina.  This process starts at the midline and then spreads back into the posterior region.  By the time the embryo is eight weeks old, there are ten areas on the upper and lower arches that will eventually become the<unk>  dentition.  These<unk>  will continue to form until they erupt in the mouth. In the<unk>  dentition there are a total of twenty<unk> : five per quadrant and ten per arch. The eruption of these<unk>  begins at the age of six months and continues until twenty-five to thirty-three months of age.  The first<unk>  seen in the mouth are the mandibular centrals and the last are the maxillary second molars.
The<unk>  dentition is made up of centrals, laterals, canines, first molars, and secondary molars;  there is one in each quadrant, making a total of four of each tooth.  All of these are replaced with a permanent counterpart except for the first and second molars; they are replaced by premolars.  The<unk>  will remain until the age of six.  At that time, the permanent<unk>  start to appear in the mouth resulting in mixed dentition. The erupting permanent<unk>  causes root resorption, where the permanent<unk>  push down on the roots of the<unk>  causing the roots to be dissolved and become absorbed by the forming permanent<unk> . The process of shedding<unk>  and the replacement by permanent<unk>  is called exfoliation. (Brand 195) This may last from age six to age twelve. By age twelve there usually are only permanent<unk>  remaining.
Various cultures have customs relating to the loss of<unk> ; see tooth fairy.<unk>  are considered essential in the development of the oral cavity by dental researchers and dentists. The permanent<unk>  replacements develop from the same tooth bud as the<unk> ; this provides a guide for permanent<unk>  eruption. Also the muscles of the jaw and the formation of the jaw bones depend on the primary<unk>  in order to maintain the proper space for permanent<unk> . The roots of<unk>  provide an opening for the permanent<unk>  to erupt. These<unk>  are also needed in the development of a child’s ability to speak and chew their food correctly.
The American Academy of Pediatric Dentistry recommends that “infants be seen by a dentist by 6 months or after the eruption of the first primary tooth and by no later than the age of 1” (Wilkins, p 783).    During that visit, parents can learn how to provide proper care to a child’s<unk>  and avoid oral disease. One way to avoid the risks of oral disease in<unk>  is by using an orthodontic pacifier, a pacifier with a flattened nipple, instead of one with a nipple that is rounded. These pacifiers should not be cleaned by the parents’ mouth to avoid the spread of streptococcus mutans bacteria (cavity causing bacteria) from the parents to the baby’s mouth. Another way of preventing oral disease is by not using any kind of sweet liquid in the baby’s bottle or sippy cup.  The only liquids that should be put in these is water or milk, unless it is during meal time.  Bottles should also not be taken to bed with children because this can cause cavities.  Baby bottle caries (cavities from bottle use) are caused by a child going to bed with a bottle containing a sweet liquid such as juice or sweetened milk, when the child falls asleep the liquid collects around the<unk> . Dental researchers suggest that parents should start oral hygiene care as soon as the first tooth erupts, around the age of six months. They can do this by using an infant toothbrush and water, then after the child reaches the age of two a tiny bit of fluoride toothpaste can be used. (Wilkins, 794)
Deciduous teeth
Wisdom teeth
Deaf-mute
Veratrum
Wonder 
Stomach rumble
Gamete
Pinna