Lower Jaw Ache (left side) The future.

A week ago I was suffering from severe jaw ache (left side). Had a few antibiotics as prescribed by a physician due to absence of any observable teeth decay. Later I was advised to take an X-RAY as the stiffness and trouble in eating with the left side continued. A family doctor after seeing the X-ray suggests wisdom tooth removal stating it to be impacted followed by root canal of the near by tooth which has just started decaying. However, I have heard that without removing the impacted wisdom tooth, saving the partially infected tooth is possible. Kindly suggest. I have also been advised to subsequently remove all the other wisdom teeth (up and below) to avoid complications like this that "may" arise in the future.