This is a big exaggeration with a little truth behind it. Light brushing—a few strokes here and there—gives locks luster by distributing the scalp’s natural oils down the hair shaft. Excessive brushing, however, especially if you tug too much, can weaken strands, causing them to break. For gentle grooming, choose a brush with ball-tipped plastic bristles or long, widely spaced natural boar bristles, and use it only to detangle and style hair.
While we're at it, you should never brush wet hair—it’s too fragile. Only tackle dry locks, starting from the ends and working your way up.