Does TMJ cause a change in your jaw alignment?

I would get up every morning with a headache.After I went to the dentist she told me I had TMJ and that I have to wear a dental guard on my upper jaw every night. It did help with the pain and soon I stopped waking up with a bad headache. My dentist told me I had to stop relying on the dental guard, so I stopped wearing it for a period of 2mnths. I have not experienced any pain since I stopped wearing it but I have recently noticed (some1 brought to my attention)that my upper jaw seems to have protruded forward. Did this happen because I stopped wearing it, if yes then how is it possible or is this a side effect of the TMJ?