As I detect you've realized from your other questions, if the disc does turn out to be damaged, it's a lose-lose situation. If you un-install you won't get to re-install it, but you can't play without the disc anyway.
With that in mind, I'd suggest un-installing and going ahead with a re-install isn't likely to make anything worse.
Your End wrote...
What should I do if it does not read the disc?
As long as you have your CD key, you can register it with the EA Download Manager and re-download the game from the EA Store.