A variety of different conditions can cause tension and headaches, but one of the major ones is actually dental-related.
Some examples of what causes tension and headaches include:
When your teeth are improperly aligned, it can cause tension in the temples due to your jaw muscles being unable to fully relax. When you don’t relax your jaw muscle enough in between biting, the excess tension in the muscles in your head creates too much lactic acid. This can build up and eventually create headaches and tension. It’s a fact that not very many people have teeth that are perfectly aligned. There’s often variation that makes it so your teeth are a bit crooked or that have some overlap.
Another reason why tension happens is because of TMJ. This is related to misalignment, and it can also make misalignment worse. One of the causes of the issue is grinding too much. You grind your teeth at night, which causes more and more misalignment throughout your life. The lack of relaxing jaw muscles creates tension in your head, just like with normal misalignment, though it can get worse and worse and cause all sorts of other problems in the process as well.