Cryptic crossword clue
Damaged enamel? It’s mints being too sweet 14

The most common and most likely answer to this crossword clue is the 14 letter word SENTIMENTALISM

I've seen this crossword clue in The Times
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The straight part
We know that "being too sweet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case being too sweet = sentimentalism.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

Crossword Answer definitions

SENTIMENTALISM noun
  1. A liking for sentimental things
  2. An overly sentimental thing or condition; bathos or sentimentality
  3. A view according to which morality is somehow grounded in moral sentiments or emotions.

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