A popular and effective method is using a resin and sawdust mix. To do this:
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Collect fine sawdust, ideally from the same pine flooring.
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Mix it with a compatible wood resin to create a thick, paste-like filler.
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Apply the mixture into the gaps using a filling knife.
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Once it dries, sand it down smooth and refinish the floor to match the surrounding wood.
This technique provides a strong bond and a natural look that blends well with pine boards.