Line damage can come from a variety of sources: nicks from the teeth of fish twists from the weight of a fish on the line, kinks from being wrapped around a branch or coral, and other damage. All of these problems can weaken the line and lead to breakage. Nicks are caused by contact with objects such as rocks, coral, or the teeth of fish. They are sharp and can easily cut through the line. When they are not repaired, they can cause more serious damage to the line over time. Twists occur when a fish pulls on the line and puts torque on it. This can cause the line to twist up like a helix, which makes it weaker and more likely to break. Twists should be untwisted as soon as possible to prevent further damage.