If you have fine hair, what you should be looking for when it comes to a hairbrush is one that'll help with detangling but is also gentle on your locks, per Bustle, and boar bristle hairbrushes do both. Breakage is a big concern with fine hair and brushes made with soft boar bristles help avoid that. Hairstylist to the stars Andrew Fitzsimons, speaking to Well And Good, shared, "This type of brush has soft bristles that are gentle on the hair and scalp. The bristles' stiff texture detangles hair without pulling too hard, which can lead to hair breakage during styling." 

Do you want to get rid of sebum buildup and get your hair's natural oils flowing through your scalp? Boar bristle hairbrushes will do that for you as well, per Bustle. If you're vegan and don't like the idea of animal products, there are hairbrushes made with natural materials you can turn to instead (via Healthline). You can get the same results as from a boar bristle hairbrush. 

For blow-drying fine hair, you can opt for a mix of nylon and boar bristles, although it is recommended that you avoid heat-based styling on your fine hair if possible.