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.
Here are 8 main reasons for hard lump on jaw line. Read them and find out what causes your lump near jaw line. There are a number of reasons that would cause a hard lump on jaw line. One of the reasons could be the salivary gland. Normally these glands are small so that you do not feel them beneath your skin. Occasionally, they might get infected and you start feeling them on your skin.