A brief analysis: Mechanical brushes and household brushes suffer the same types of damage.

　　The function of mechanical brushes goes beyond what ordinary, everyday household brushes can achieve. Typically used in large-scale machining environments, mechanical brushes are known for their substantial size and high efficiency. Yet, despite these differences, mechanical brushes still share certain similarities with conventional brushes—particularly after they’ve been in use for a while.
　　Although the mechanical brush is relatively large in size, it inevitably experiences localized bristle shortening or uneven brushing edges after prolonged use. So, how should we address these issues? Ignoring them would significantly reduce the brush's efficiency, yet discarding it outright would be a real waste.
　　Actually, once the mechanical brush starts showing uneven bristles, you can use a blade to trim off the shorter hairs on both sides of the brush head and neatly reshape the brush opening—this will usually restore it to full functionality. However, keep in mind that this method only ensures the brush works properly for a limited time; after prolonged use, the same issues will likely reappear, eventually forcing you to discard it altogether. For mechanical brushes, the longer you want them to last, the more attention you’ll need to pay to regular maintenance and care.
　　For mechanical brushes that are temporarily not in use, they must be thoroughly cleaned and then carefully wrapped in clean cloth or packaging paper such as kraft paper to prevent dust from settling inside during storage, which could otherwise compromise the brush's performance.
　　For newly purchased mechanical brushes, you can gently warm the tips of the bristles with a candle to reshape their firm, sharp edges, making them better suited for optimal performance during use.