hi, Thanks for writing in. If you have got treated for tongue and jaw cancer by surgery 9 years back and now are disease free then you are cured from the cancer. Radiation has side effects like causing muscle contracture in the mouth. You might consult a plastic surgeon specialized in flap surgery and release of contractures. They might be able to help you out with surgically reconstructing the region and allowing you to open the mouth. Please note that these are highly specialized surgeries which require skill and the outcomes might differ after surgery. You might like to consult doctors in plastic surgery at a tertiary hospital in your city and then know the consequences and if a surgery might be possible or not. This can be told after clinical examination of the opening of your mouth. Please know all the results of such a surgery before getting it done and discuss in detail.