The quick way to fill the divots is with CA or epoxy and rosewood dust. This is rather ugly on rosewood. The way I prefer is to rout out rectangles from fret to fret and inlay matching wood. This can be almost impossible to detect.
OTOH, there is no functional reason to fill them at all.
Trim your nails and wash your hands before playing. The wear is usually between the strings, not under them.
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