Hi Heather,
Joint cartilage has sponge-like qualities. If the joint is not compressed sufficiently, waste products will not be removed from around the cartilage cells. When the cartilage has not been compacted, it cannot later expand, drawing nutrients into itself. Cartilage has no direct blood supply, therefore it must rely on alternate periods of expansion and compression to properly nourish and remove waste products from its component cells. Without this expansion and compression, the net effect is an eventual breakdown and degeneration in the cartilage. The body will lay down bone and begin the arthritic process. If you are a chronic clencher or grinder, the cartilage may never be able to swell and expand, and the cells within the cartilage may be damaged due to a lack of nutrition.
(A little "technical" I know, but hope this gives you an idea of the TMJ/arthritis relationship.)
Marlene
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