Yes, a fret dressing is often done when the fret wear isn't enough to require fret replacement. The dressing reduces the height of the frets dressed and it is normal to dress all frets so that all have the same resulting height, as that makes it easier to adjust the string action properly.
Although a fret dressing can extend the time until new frets are needed, dressing the upper frets (even though they haven't been used much) can call for complete fret replacement later instead of a partial fret replacement (e.g., only the first 7 frets).
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