Why is the gentle leader a successful tool for dogs who pull?

A gentle leader is a type of tool that is used for a certain animal which are the dogs. This is beneficiary for not only to humans who owns a pet dog but also the dog itself. It is considered to be a successful tool for dogs who pull because this has a lot of benefits in helping a dog such as it lessens the pulling of the dog that could hurt their throats when they used a leash. But with the gentle leader, this will not only help them not to feel pain but to prevent them from having to be pulled off.