Final answer:
Synthetic brushes are typically less durable and may snag the hair due to their plastic or nylon bristles, which can be more rigid compared to natural bristles like those from boar.
Step-by-step explanation:
The type of brushes that may not be as durable and may snag the hair are typically synthetic brushes. Unlike boar bristle brushes, which are known for their natural softness and flexibility, synthetic brushes often use plastic or nylon bristles that can be more rigid and rough on the hair and scalp. When using synthetic brushes, especially those of lower quality, users might experience pulling or snagging, which can lead to breakage and damage to the hair. Paddle brushes and vent brushes are often used to detangle and style hair and come in both natural and synthetic bristles; the durability and gentleness depend on the material and construction of the brush. Therefore, if having a brush that does not snag the hair and is durable is important, one may consider investing in a higher-quality brush or one with natural bristles like those from boar.