What can a toothache do to your brain when you have a headache and nothing shows up on a cat scan

What can a toothache do to your brain when you have a headache an…?

http://www.chacha.com/question/what-can-a-toothache-do-to-your-brain-when-you-have-a-headache-and-nothing-shows-up-on-a-cat-scan

If left untreated, a toothache caused by an abscess can cause bacteria to spread to the brain, which could cause death.