Tooth structure includes: Gingiva covering the crown.
Root inside the socket of a bone.
Blood vessels surrounding the outside of the crown.
Dentin surrounding The enamel
Haustra inside the dentin.

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

2. it provides great potential for discovering treatments and cures to a variety of diseases including parkinson disease, spinal cord injuries, diabetes, alzheimer’s disease and many more.

3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;