Don't quote me... but my personal feeling is yes, it can kill you.... via the infection spreading to your brain.

I had a bad tooth which started my mercury poisoning experience... a dentist ignored... made it worse by doing work on a different tooth while it was infected... I ended up with a really infected tooth and it really felt like not only my toth was infected but like there was an infection in my head.

I had it extracted. It drained and the infection went away after a few days for the most part.. took a few weeks to really clear up completely. I drank a lot of echinacea tea.

Salt water and baking soda is good to keep it at bay, also put hydrogen peroxide on it, it will hurt when you start doing either of those, keep at it. Too bad most dentists won't tell you those simple things... I'm sure they must know... but their wallets take priority, quite a sad situation.

You must get the tooth removed if it's real bad.