Hello, i had tooth #26 extracted and bone grafted due to resporbtion, it is now cold sensitive 3 days later. is that normal and what can i do? thanks

Perfectly normal: because there's been a bone lost on the side of the tooth #25 and # 27 where the extraction was performed. This has caused the root of the sensitive tooth to be exposed to the oral environment and that's caused the sensitivity to cold or hot. Be patient, nothing need to be done.

Cold sensitivity: Ir is common for the neighboring teeth to have some cold sensitivity are healing proceeds after the extraction because some of the roots may be exposed as tissues heal. Sensodyne toothpaste can help in the short term. Talk to your dentist about this.

Normal: If you had gum/bone loss requiring bone graft, possibly adjacent teeth now have some root exposure. Also, when you have surgery sensory nerves are affected and take time to heal. Call the treating Dentist, Oral Surgeon, or Periodontist that did the surgery to report your symptoms.