Muscle aches are a fact for all athletes, but sometimes they show up in unexpected places. An aching jaw can be caused by many things from clenching your jaw when you run to the beginnings of a cavity. A lesser known possible cause of an aching jaw is muscle cramps caused by taking too much creatine.
Creatine Facts

Creatine is an amino acid. The amino acids combine with each other to form proteins. Creatine occurs naturally in your body, in your pancreas, kidneys and liver. It can also be found in the meat of wild game and in such fish as salmon. Creatine is stored in your muscles and used for energy during short, intense bursts of activity. Many bodybuilders use creatine supplements in the belief that creatine improves performance. Preliminary evidence supports this, but more clinical trials are needed to confirm it.
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Jaw Aches

Jaw pain can occur anywhere in the jaw, including the bone at the hinge of the jaw where the large muscles that control chewing are located. They can be caused by cavities in the molars, an impacted wisdom tooth or by grinding your teeth in your sleep. An overabundance of creatine in your system can contribute to dehydration if taken with caffeine or diuretics. One of the symptoms of dehydration is muscle aches, which could affect the muscles in the hinge of your jaw.
Benefits

Taking creatine supplements may help to lower overly high levels of trigliycerides in your blood, according to the University of Maryland Medical Center, although more studies are needed. Some people report that taking creatine improves athletic performance, although this seems to work differently among individuals. Preliminary clinical studies also suggest that people who take creatine can exercise longer without getting tired, although these studies have been conducted in laboratory conditions rather than using people playing sports.
Warning

Taking creatine with caffeine or with diuretics can lead to dehydration. Taking too high a dosage may lead to kidney disease. Aching jaws may be caused by nothing more than muscle fatigue, but the pain can also be a sign of Temporomandibular Disorder. This is a condition in which the main muscle group in your jaw is fatigued or stressed to the point of pain and weakness. TMD has many causes and sometimes requires treatment. If you are experiencing jaw aches, do not attempt to self-diagnose. Consult your doctor or dentist.