I broke 4 teeth 6 days ago they arent painful but they are sensitive and have jagged ends now but im mostly concerned because the exposed parts are black and the teeth are hardening and changing color rn they are darkish yellow im scared what to do?

There is only one thing you can and should do... make an appointment with a local dentist to have your teeth examined. After the exam your dentist will advise you of your treatment options.

Sounds like the teeth may have been decayed, hollowed out on the inside by decay, weakening the enamel as the decay progressed. No choice. You can't fix this bye y9urself. Please seek evaluation by a General Dentist in our area. Please do not delay.