I assume because water expands when frozen the cool temp of the fridge expands the bristles adding in them splitting but I don’t know how much water will expand in a fridge as most fridges sit at anywhere from +4c to +1 so in saying that it could do that or make the tips more brittles so they pop open better faster
H2O has its minimum volume at 4 celsius, so keeping the brush in fridge doesn't expand anything more than room temp. Ice does have increased volume. Feel free to freeze your brush and tell us how it went
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