Specific events leading to the formation of the periodontal ligament vary between deciduous (baby) and permanent teeth and among various species of animals.

This perpetual creation of periodontal ligament leads to the formation of groups of fibers in different orientations, such as horizontal and oblique fibers.

1.128 600,000 refugees will have been treated for dental and periodontal problems each year and more than 200,000 children and pregnant women will have been screened for detection of dental caries.