Polyester bristles are synthetic fibers commonly used in brushes, including toothbrushes, paintbrushes, and cleaning tools. They are made from a type of plastic called polyester, which is durable, flexible, and resistant to moisture. This makes them ideal for various applications, as they can maintain their shape and effectiveness over time. These bristles are often preferred for their ability to hold up against wear and tear, unlike natural bristles. Additionally, polyester bristles can be manufactured in different stiffness levels, allowing for a range of uses from gentle cleaning to more aggressive scrubbing, depending on the specific needs of the user.