The deficiency of Fluorine leads to dental caries, which is the scientific name for tooth decay or cavities.

Fluorine is a mineral that helps to prevent tooth decay by strengthening the tooth enamel, which is the hard, protective outer layer of the teeth. It does so by making the tooth enamel more resistant to the acid produced by bacteria in the mouth, which is the primary cause of tooth decay.

The lack of fluorine in the body can cause a condition called dental fluorosis, which is characterized by white or brown spots on the teeth and weak tooth enamel. In severe cases, it can also lead to dental caries or tooth decay.

It is important to note that while fluorine is necessary for good dental health, excessive intake can also lead to health problems such as skeletal fluorosis, which is a condition where fluorine accumulates in the bones and joints, causing pain and stiffness.

In conclusion, the deficiency of fluorine is responsible for dental caries, as it helps to prevent tooth decay by strengthening the tooth enamel. However, excessive intake can also lead to health problems, and therefore, it is important to maintain a balance in the intake of fluorine.