Had upper wisdom tooth extracted 3 days ago. looked at site and there appears to be part of my tooth left and no blood clot. in some pain. worried?

3rd molar extraction: If in fact there is a residual fragment either tooth or bone and no clot I suggest you return to the dentist that performed the extraction for evaluation and remedy.

Follow up: with your dentist to make sure there is no retained tooth and everything is progressing as it should.

Exam required: you need to be examined by your treating doctor or an oral surgeon to determine weather tooth remains in the socket or bone chips and why no blood clots formed to start the healing process.

It is not normal: The symptoms of dry socket include pain, bad breath, foul taste and and no blood clot. When that's the case, see your dentist for dry socket dressing appointment.

See dentist.: Probably OK. Clots turn white after a while and complaint of "tooth fragment" is common. See dentist to make sure.