Preposition: of

• concern: Of these approximately one quarter will have fluorosis of esthetic concern, but the precision of these rough estimates is low.

Converse of object

• have: Irish dental surgeon, Donal McAuley, wrote in the British Medical Journal: " Fifty per cent of our population has dental fluorosis.

Adjective modifier

• dental: For three quarters of a million people, dental fluorosis is of the " moderate to severe " degree.

• skeletal: So have Japan and India, where fluoride occurs naturally and skeletal fluorosis ( thickening of bones ) is prevalent.

• mild: This mild fluorosis is often undetectable except by a dental expert.

• endemic: Endemic fluorosis: an analysis of needs and possibilities based on case studies in Kenya.

• unsightly: Beside being unsightly, fluorosis can have a psychological impact, and cosmetic dentistry is expensive.

Modifies a noun

• study: The fluorosis studies were largely cross-sectional designs, with only four before-after designs.

Noun used with modifier

• enamel: Dean's criteria were followed to assess enamel fluorosis.

• cause: Fluoride is implicated in pre-senile dementia and Alzheimer's disease. n. Fluoride causes fluorosis.

• fluoride: Fluoride is implicated in pre-senile dementia and Alzheimer's disease. n. Fluoride causes fluorosis.