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Originally Posted by
Threadbearer 
Thanks. I really appreciate your reply. Is there any evidence that the likelihood of complications increases with age, or is it just that adults in general usually have more problems than kids? I'm asking because I'm almost 50.
What can be done for that 10% of unfortunates?
I'll certainly do that. However, I want to get some disinterested opinions first. I'm afraid that any orthodontist I see may be tempted to gloss over the risks so as to make me more likely to become a client. I'd prefer to gather more information before making an appointment so that I'll have a better chance of detecting any BS.
To answer your first question, TMD sort of peaks in the mid-30s and tapers away for most by the mid-40s. Honestly, I can't recall ever seeing a "severe" case of TMD in somebody over 55 or so. Also, in my experience (I'm not sure what the literature says), female TMD sufferers outnumber males by at least 4 times. Knowing that you're a 50ish year old male, I'd say your risk is very low, relatively.
In terms of treatment for those with severe TMD, usually it is palliative more than anything. In other words, it is very hard to treat the "cause" because often the cause is unknown. Stress is a big factor in TMD, despite the fact that the patient often refuses to believe this truth. Successful TMD treatment usually involves simply doing "something"; quite literally the fact that the condition is being treated in some way, often leads to alleviation of symptoms, even if the treatment itself isn't a direct cause of the relief. That said, treatment usually involves a combination of physiotherapy, an intra-oral splint, a stress-relief program, and pain management.
In terms of an orthodontist avoiding full risk disclosure to gain a patient, I'll have to respectfully disagree. In the US particularly, the risk of being sued for lack of informed consent is simply too high to "leave out details"; even here in Canada, most orthodontists will outline the risks of treatment verbally with the patient present (for perhaps 5 minutes) and have the patient sign that they understand and consent to any risk as described.
Go get yourself some braces, or Invisalign if it suits your case!