The Social Security Administration (SSA) has two methods for determining whether a claimant is disabled and unable to work. First, the SSA will determine whether or not the claimant has a condition which is so severe it meets or exceeds a listing on the SSA Listing of Impairments. This listing, also called the SSA Blue Book, has all of the symptoms and diagnosis which the SSA considers automatically disabling and which do not allow the claimant to perform substantial gainful activity (SGA).
There is not a listing for TMJ on the SSA Listing of Impairments. This does not mean that you cannot prove that your condition is as severe as a condition which is listed, but it will be very difficult. Claimants who have suffered a severe trauma may be able to win SSDI or SSI if they have additional conditions, in addition to TMJ, that will meet a listing.