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Fluorosis: An abnormal condition (as mottled enamel of human teeth) caused by fluorine or its compounds.
Fluorosis is a condition caused by an increased intake of fluoride. Dental (enamel) fluorosis is the most common manifestation, but skeletal fluorosis can also occur. Although extremely rare in the United States, skeletal fluorosis is seen in other countries, especially India and China.

The appearance of fluorosis is as follows:
The very mild and mild forms of dental fluorosis appear as chalk-like, lacy markings on the tooth’s enamel surface. These are difficult to see with the untrained eye.
In the moderate form of dental fluorosis, a white opacity can be seen on more than 50% of the tooth.
The severe form of fluorosis results in brown, pitted, brittle enamel.

Dental fluorosis occurs during the development of the tooth, with permanent teeth being more susceptible than primary teeth. Further, dental fluorosis is less prevalent and less severe in the primary teeth than in the permanent dentition.

The most critical ages of susceptibility are from 0 to 6 years, especially between the ages of 15 and 30 months (15-24 months for boys, 21-30 months for girls). After 7 or 8 years of age, dental fluorosis cannot occur because the permanent teeth are fully developed, although not erupted.
Fluorosis ranges in severity from mild to severe.
Permanent teeth are more susceptible to fluorosis than primary dentition.
The most susceptible age for fluorosis is between 15 and 30 months.
Enamel fluorosis is increasing in prevalence in the United States.
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