Sometimes, my jaw clicks and crunches so much that I wonder if there’s a tiny seed or cracker shard stuck deep in the back of my mouth.Still, I’ve never thought much of it ― I’ve always reckoned it’s due to my constant tensing and clenching. But according to the NHS, the sound could reveal a condition I’d never heard of before. “Temporomandibular disorder (TMD) is a condition affecting the movement of the jaw,” their site reads, and can create the sound.Though the NHS stresses the condition is “not usually serious and generally gets better on its own”, the website adds that TMD sometimes needs attention from a dentist, doctor, physiotherapist or psychologist.What is TMD and what are its signs?TMD can be caused by tooth grinding, stress, wear and tear and uneven teeth that don’t slot together well enough. It’s a muscle issue that can limit how much you can move your jaw. It can cause pain and stiffness in your ear, jaw, and even temples. Per the NHS, some of its symptoms include: <