quite unlikely, but never say never... jsut to give you an idea score has never fallen below 450.
dentistry is a controlled profession however, i think you need to do some research before you apply into EE...
FYI - you should try for PNPs, they will almost guarantee an ITA.
If you have some time to research on your own, you don't have to hire a consultant. Most of what you need to know is on the forum and the official IRCC website.