According to the USDA, heavy cream can be stored in the refrigerator (opened or unopened) for up to a month. 1  This assumes that it has been kept at a constant refrigerator temperature and not left out on the counter for stretches of time. Discard any cream with mold or an off odor.
However, one of the most common causes of lockjaw, as already mentioned, is TMJ disorder. TMJ disorder refers to a syndrome that affects the temporomandibular joint, commonly called the TMJ, which connects the jaw with the bottom of the skull.
But in many cases, the problem isn't the joint connecting the jaw to the skull, but muscular tension caused by clenching your teeth while under stress. Before you schedule that operation, ease tension in muscles that operate the jaw: Open your jaw as wide as you can, hold for a few moments, then gradually let it relax.