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.
If your jaw is locked open or closed, go to a hospital's emergency department. The open locked jaw is treated by sedating you to a comfortable level. Then the mandible (upper jaw) is held with the thumbs while the lower jaw is pushed downward, forward, and backward. This maneuver is usually done by the Emergency Department physician or an ear, nose, and throat (ENT) specialist. The closed locked jaw is also treated by sedating you until you are completely relaxed.