Here's a tip, something I do to preserve my sable brushes: clean them with "soft soap" and wrap them with toilette paper. On top of that place a clip. The form stays good and except for a small bend in the hair from the clip. It doesn't work as well with synthetic brushes.
Also, it is possible to soften some edges with a "good" brush by running the brush over the edge while it is wet. Both sides of the edge have to be wet.
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