What does the cryptic crossword clue "With fluorine, no longer having to clean teeth (5)" mean?

The definition is "to clean teeth". The wordplay uses a charade (building blocks). F (synonym="fluorine") + LOSS (synonym="no longer having") = FLOSS; definition: "to clean teeth" The answer is FLOSS.

With fluorine, no longer having to clean teeth (5)

Times Cryptic #28613 | 25 Across | 2023-05-26 flower

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