The opportunities offered by preventive medicine to patients may not have been utilized; For example, caries in milk teeth may not have been treated with the logic of "it will change anyway", teeth may have been extracted prematurely, and fluoridation and fissure protection applications may have been ignored.

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Each milk tooth has a time and order for it to fall out, and the permanent tooth coming from the bottom also has a time and order for it to erupt. If this order is disrupted, there is a possibility of crookedness in the permanent teeth. For example, the upper canine teeth (canine teeth) are the last teeth to erupt in the mouth. Therefore, the upper primary canine teeth should be the last primary teeth to fall out. If the primary canine tooth is lost early, the upper midline will shift towards that side and the permanent canine tooth will erupt from above and outside the arch. There may even be a possibility that this tooth will remain impacted.

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• Genetic factors: It is important, especially in individuals with skeletal disorders, whether there is a similar anomaly in their family history. Hereditary tooth deficiencies, narrow upper jaw, and crowding problems can also be passed on to the child. In this case, the emergence of orthodontic problems is inevitable. What needs to be done is; is to take the child for regular dentist check-ups, starting from the primary dentition period.

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Additionally, the child may inherit a small jaw gene from one parent and a large tooth gene from the other. In such a case, the teeth will not be able to fit into the jaw and will be arranged crookedly. Similarly, a large jaw gene can be inherited from one parent and a small tooth gene can be inherited from the other. In this case, gaps (diastema) will form between the teeth.

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• Ear - nose - throat problems: (such as tonsillitis, presence of nose and adenoids; constant mouth breathing) can prevent the formation of jaw bones and cause tooth eruption disorders. 

• Bad habits: Bad habits such as thumb sucking, using a pacifier or bottle for a long time, tongue sucking, lip sucking, pen biting can also cause orthodontic disorders in teeth and jaw structures. 

• Some muscle disorders can also cause orthodontic problems.