What does the cryptic crossword clue "Prevents tooth enamel defects (7)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Prevents tooth enamel defects (7)

Guardian Cryptic #28429 | 28 Across | 2021-04-26 flower

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