Had bottom wisdom teeth extracted over three weeks ago. all teeth still sensitive. bottom teeth/jaw area feels tight. normal?

Yes: Besides healing from the surgery, your mouth is adjusting to the loss of those teeth (a good thing). Give it some time.

Time: Different people heal at different rates. You're probably right on schedule. It would not be out of place, however, for you to call the Dentist or Oral Surgeon who did the extractions to discuss your concerns, if for no other reason than your own peace of mind.

Can be.: Often it takes quite a while to become comfortable after surgery. Individuals vary in their ability to be stretched open and remain there and therefore vary in recovery time. Do not keep testing it by overopening. You may massage the muscles where the tightness is to see if it will help. Sensitivity is usually due to exposed root where tissue healing. Call Surgeon if doesn't improve. Good Luck.

Normal: Within normal limits. If still problematic after 2 weeks, see oral surgeon for evaluation.

Not Uncommon: Patients recover differently from surgical procedures. If you have a small mouth, deeply impacted wisdom teeth, and a lengthy procedure, the symptoms you describe are not uncommon.