question: why do baby teeth come out straight and even, but adult teeth come out crooked and crowded?
comment: Because baby teeth don’t have anything in the way to come out and the come out at roughly the same time, adult teeth usually come out around the ages of 7 until 12 (I think) and are trying to force their way into a spot that may still have a baby tooth or other ones around it and can’t grow properly
passages: BULLET::::- More teeth appear, often in the order of two lower incisors then two upper incisors followed by four more incisors and two lower molars but some babies may still be waiting for their first.
  
  BULLET::::- Arm and hands are more developed than feet and legs (cephalocaudal development); hands appear large in proportion to other body parts.
  
  BULLET::::- Legs may continue to appear bowed.
  
  BULLET::::- "Baby fat" continues to appear on thighs, upper arms and neck.
  
  BULLET::::- Feet appear flat as arch has not yet fully developed.
  
  BULLET::::- Both eyes work in unison (true binocular coordination).
   BULLET::::- Early loss of deciduous teeth - Whether due to caries, premature exfoliation or planned extraction – the early loss of deciduous teeth results in an increase in the severity of pre-existing crowding. When crowding is present the remaining teeth will drift or tilt into the free space provided. The younger the patient is when the tooth is lost and the earlier in development the adjacent teeth are the more serve the effect.
  
  BULLET::::- Hyperdontia - Hyperdontia is the congenital condition of having supernumerary teeth. Hyperdontia can result in crowding due to an increased number of teeth within the arch.
   Neonatal teeth
  
  Natal teeth are teeth that are present above the gumline (have already erupted) at birth, and neonatal teeth are teeth that emerge through the gingiva during the first month of life (the neonatal period).
  
  The incidence of neonatal teeth varies considerably, between 1:700 and 1:30,000 depending on the type of study; the highest prevalence is found in the only study that relies on personal examination of patients.
   Micrognathism
  
  Micrognathism is a condition where the jaw is undersized. It is also sometimes called "mandibular hypoplasia". It is common in infants, but is usually self-corrected during growth, due to the jaws' increasing in size. It may be a cause of abnormal tooth alignment and in severe cases can hamper feeding. It can also, both in adults and children, make intubation difficult, either during anesthesia or in emergency situations.
  
  Section::::Causes.
  
  While not always pathological, it can present as a birth defect in multiple syndromes including:
  
  BULLET::::- Catel–Manzke syndrome
  
  BULLET::::- Bloom syndrome
  
  BULLET::::- Coffin–Lowry syndrome
  
  BULLET::::- Congenital rubella syndrome
   Natal and neonatal teeth are an anomaly that involves teeth erupting in a newborn infant’s mouth earlier than usual. The incidence ranges from 1:2,000 to 1:3,500 births. Natal teeth are more frequent, approximately three times more common than neonatal teeth. Some authors reported a higher prevalence in females than males. The most common location is the mandibular region of the central incisors. Natal teeth and neonatal teeth are associated with genetics, developmental abnormalities and certain recognized syndromes. Additional names for this condition include precocious dentition, baby teeth, and milk teeth.
  
  Section::::See also.
  
  BULLET::::- Polyphyodont
  
  BULLET::::- Tooth regeneration
   Natal teeth, and neonatal teeth, can be the baby's normal deciduous teeth, sprouting prematurely. These should be preserved, if possible. Alternately, they could be supernumary teeth, extra teeth, not part of the normal allotment of teeth.
  
  Section::::Signs and symptoms.
  
  Most often natal teeth are mandibular central incisors. They have little root structure and are attached to the end of the gum by soft tissue and are often mobile.
  
  Section::::Causes.
  
  Most of the time, natal teeth are not related to a medical condition. However, sometimes they may be associated with:
  
  BULLET::::- Ellis–van Creveld syndrome
  
  BULLET::::- Hallermann–Streiff syndrome
  
  BULLET::::- Pierre Robin syndrome
   Embryonic age: 7 weeks and 0 days until 9 weeks and 6 days old.
  
  BULLET::::- Embryo measures in length.
  
  BULLET::::- Ventral and dorsal pancreatic buds fuse during the 8th week
  
  BULLET::::- Intestines rotate.
  
  BULLET::::- Facial features continue to develop.
  
  BULLET::::- The eyelids are more developed.
  
  BULLET::::- The external features of the ear begin to take their final shape.
  
  BULLET::::- The head comprises nearly half of the fetus' size.
  
  BULLET::::- The face is well formed.
  
  BULLET::::- The eyelids close and will not reopen until about the 28th week.
  
  BULLET::::- Tooth buds, which will form the baby teeth, appear.
   Section::::Development.
  
  The primary tooth will begin to show signs of development between 14 weeks and 16 weeks in utero, at an average of 16 weeks.
  
  The permanent tooth typically will erupt between when the child is 8 or 9 years old, while the root will continue to mineralize until around 11 years old.. The tooth's crown will conclude its development around the age of 4 or 5.
  
  Section::::Deciduous dentition.
   Several traditions concern throwing the shed teeth. In Turkey, Cyprus, and Greece, children traditionally throw their fallen baby teeth onto the roof of their house while making a wish. Similarly, in some Asian countries, such as India, Korea, Nepal, the Philippines, and Vietnam, when a child loses a tooth, the usual custom is that he or she should throw it onto the roof if it came from the lower jaw, or into the space beneath the floor if it came from the upper jaw. While doing this, the child shouts a request for the tooth to be replaced with the tooth of a mouse. This tradition is based on the fact that the teeth of mice grow for their entire lives, a characteristic of all rodents.
   It is important to note the difference of ages that play a role in eruption of the posterior molars. An adolescence has an inter-maxillary growth space which allows the posterior molar eruption without any relapse in the later age when relative intrusion is performed in their orthodontic treatment. However, if relative intrusion is performed in adults who have a deep bite tendency with short anterior lower facial height, there is a higher chance of relapse of this movement. This is due to two reasons: Adults do not have intermaxillary growth space that posterior teeth can erupt into and adults tend to have a strong facial jaw musculature which leads to "pound" the molars back into their original position. Therefore, in an orthodontic treatment it is important to diagnose a patient with a type of facial growth that is occurring before taking any treatment steps.
   Around a year after development of the teeth is complete, the jaws continue to grow which results in spacing between some of the teeth (diastema). This effect is greatest in the anterior (front) teeth and can be seen from around age 4 – 5 years. This spacing is important as it allows space the permanent (adult) teeth to erupt into the correct occlusion, and without this spacing there is likely to be crowding of the permanent dentition.
   Dilaceration
  
  Dilaceration is a developmental disturbance in shape of teeth. It refers to an angulation, or a sharp bend or curve, in the root or crown of a formed tooth.
  
  Section::::Description.
  
  The condition is thought to be due to trauma or possibly a delay in tooth eruption relative to bone remodeling gradients during the period in which tooth is forming. The result is that the position of the calcified portion of the tooth is changed and the remainder of the tooth is formed at an angle.
   As the primary (baby) teeth begin to erupt at 6 months of age, the maxillary and mandibular teeth aim to occlude with one another. The erupting teeth are moulded into position by the tongue, the cheeks and lips during development. Upper and lower primary teeth should be correctly occluding and aligned after 2 years whilst they are continuing to develop, with full root development complete at 3 years of age.
   BULLET::::- Developmental crowding of lower incisors - Inter-canine growth increases up to the age of 12–13 years, followed by a gradual diminution throughout adult life. This reduction is arch size is considered a developmental phenomenon
   Section::::Society and culture.
  
  In almost all European languages the primary teeth are called "baby teeth" or "milk teeth". In the United States and Canada, the term "baby teeth" is common. In some Asian countries they are referred to as "fall teeth" since they will eventually fall out.
  
  Although shedding of a milk tooth is predominantly associated with positive emotions such as pride and joy by the majority of the children, socio-cultural factors (such as parental education, religion or country of origin) affect the various emotions children experience during the loss of their first primary tooth.
   Teething age of primary teeth:
  
  BULLET::::- Central incisors : 6–12 months
  
  BULLET::::- Lateral incisors : 9–16 months
  
  BULLET::::- First molars : 13–19 months
  
  BULLET::::- Canine teeth : 16–23 months
  
  BULLET::::- Second molars : 22–33 months
  
  Section::::Function.
   Generally, there are gender differences in the appearance of this tooth. In males, the size of the maxillary central incisor is larger usually than in females. Gender differences in enamel thickness and dentin width are low. Age differences in the gingival-incisal length of maxillary central incisors are seen and are attributed to normal attrition occurring throughout life. Thus, younger individuals have a greater gingival incisal length of the teeth than older individuals.
  
  Section::::Permanent dentition.:Labial view.
   "Linking to the Past" by Kenneth L. Feder states that "Dental development...provides a valuable gauge of the level of physical maturity and age." 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; at this point in development, there are twenty teeth in all.
   Section::::Type of cases.:Deep bite with horizontal facial growth pattern.
  
  In these types of cases, a patient has reduced anterior lower facial height and they have a skeletal deep bite tendency. It is essential in these type of patients, to increase the vertical height of the face and one of the most common ways this can be performed is through relative intrusion. This movement involves extrusion of the posterior molars and is sometimes combined with intrusion of anterior incisors.
   Pulling on the ears is another sign of pain; the pain in the mouth throbs throughout the baby's head so they pull their ears believing that it will provide relief. Mild rash can develop around the mouth due to skin irritation that is caused by excessive drooling or dribbling.
  
  Section::::Signs and symptoms.:Sequence of appearance.
  
  The infant teeth tend to emerge in pairs – first one lower incisor emerges then the other lower incisor emerges before the next set begin to emerge. The general pattern of emergence is:
  
  BULLET::::1. Lower central incisors (2) at approximately 6 months
   Open bite malocclusion can happen due to several reasons. It may be genetic in nature, leading to a skeletal open bite or can be caused by functional habits which may lead to dental open bite. In the earlier age, open bite may occur due to a transitional change from primary to the permanent dentition. Some factors that may cause an open bite are:
  
  BULLET::::- Tongue thrusting
  
  BULLET::::- Thumb sucking
  
  BULLET::::- Long-term usage of Pacifier
  
  BULLET::::- Macroglossia
  
  BULLET::::- Airway obstruction
  
  BULLET::::- Adenoid hypertrophy
  
  BULLET::::- Nasal concha Hypertrophy
  
  Section::::Types.
  
  Section::::Types.:Anterior open bite.
   In a patient who has a clockwise growth pattern, the sum of 3 angles will be higher than 396 degrees. The ratio of posterior height (S-Go) to Anterior Height (N-Me) is 56% to 44%. Therefore, a tendency to open bite will occur and a downward, backward growth of mandible will be observed.
  
  Section::::Analyses (analytic approaches) by various authors.:Ricketts analysis.
  
  The Rickett analysis also consists of following measurements
  
  Section::::Analyses (analytic approaches) by various authors.:Sassouni analysis.
   BULLET::::2. Permanent: formula_2 This can also be written as . When the upper and lower dental formulae are the same, some texts write the formula without a fraction (in this case, 2.1.2.3), on the implicit assumption that the reader will realise it must apply to both upper and lower quadrants. This is seen for example throughout "The Cambridge Dictionary of Human Biology and Evolution".
   Dilaceration is an abnormal bend found on a tooth, and is nearly always associated with trauma that moves the developing tooth bud. As a tooth is forming, a force can move the tooth from its original position, leaving the rest of the tooth to form at an abnormal angle. Cysts or tumors adjacent to a tooth bud are forces known to cause dilaceration, as are primary (baby) teeth pushed upward by trauma into the gingiva where it moves the tooth bud of the permanent tooth.
   The level of pain that a baby can handle will be different for each child. Some may appear to suffer more than others while they are teething. The soreness and swelling of the gums before a tooth comes through is the cause for the pain and fussiness a baby experiences during this change. These symptoms usually begin about three to five days before the tooth shows, and they disappear as soon as the tooth breaks the skin. Some babies are not even bothered by teething.
  
raw_presuppositions: Adult teeth always come out crooked and crowded.
raw_corrections: Adult teeth come out crooked and crowded when a baby tooth interferes.