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How to shave chest hair
Trim your chest hair outside of the shower.
You wouldn't take a cartridge razor to your beard before trimming it down, and the same can be said for shaving any body hair. Start with a trimmer on the shortest setting to give you better visibility and necessitate fewer strokes when you go for the razor.
Make sure you trim with completely dry skin and hair. Wet hair will stick to your chest making it harder to trim, and it can also stick to the trimmer.