Abstract
In 1974-75, mottling in incisor teeth was assessed among a random sample of 13- to 14-yr-old children in Liverpool, England. The number of children examined was 463. All of these children were born and lived in Liverpool when the fluoride content of the water supply averaged 0.12 parts/106. The mouth prevalence of mottling was 42.5%. The tooth prevalence of mottling was 9.6%. There was no sex difference. A considerable proportion of mottling observed in fluoride and non-fluoride communities was caused by factors other than ingested fluoride.

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