Frets can be visually deceptive in their smoothness. I'd get a bit of fine wire, a short offcut from a top E string on an acoustic or electric will do fine, and run it along the frets. If its not 100% smooth you'll feel it snagging and the fret needs more work. You may not feel it with classical strings, but it will still be there and any rough frets will be wearing away at your strings and shortening their lives.
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