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The Masseter Muscle is a thick muscle which is primarily responsible for our chewing action. It is one of the strongest muscles in the entire human body. The Masseter muscle is a very thick muscle made up in two parts the Outer Masseter muscle and the Inner Masseter muscle.
There is no doubt that clenching your teeth will exercise the muscles and in time they will build bulk. There are a number of muscles that you use to close your jaw. This includes the temporalis, masseter, and two more muscles on the other side of the jaw bone from where the masseter is (the pteregoids).