Branches of nerve are desensitized when a dentist gives a shot of novocain which prevents pain impulse transmission from the teeth and gums.

Trigeminal

Explanation:

Its the nerve that is responsible for sensation in the face and motor functions such as biting and chewing; it is the largest of the cranial nerves.

dna damages cause changes in the structure of the genetic material and prevents the replication mechanism from functioning and performing properly. dna damage and mutation have different biological consequences. while most dna damages can undergo dna repair, such repair is not 100% efficient.

segmentation=endoskeleton=backbone=coelom=tissues