Yes, a razor cut will damage the ends, and they will the be prone to split. Get a pair of scissors made for cutting hair, and never use them for anything else. This last part is important: only use them to cut hair, nothing else, ever. Unfortunately, I am clueless about where to find good, affordable hair scissors in Europe.
When I S&D, I cut about 3 millimeters above the split or white dot.
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