Modern medical science has not yet discovered how to bring a dead body back to life.
The heavenly physicians like the Asvini-kumaras could give youthful life even to one who was advanced in age. Indeed, great yogis, with their mystic powers, can even bring a dead body back to life if the structure of the body is in order. We have already discussed this in connection with Bali Maharaja’s soldiers and their treatment by Sukracarya. Modern medical science has not yet discovered how to bring a dead body back to life or bring youthful energy to an old body, but from these verses we can understand that such treatment is possible if one is able to take knowledge from the Vedic information. The Asvinikumaras were expert in Ayur-veda, as was Dhanvantari. In every department of material science, there is a perfection to be achieved, and to achieve it one must consult the Vedic literature. The highest perfection is to become a devotee of the Lord. To attain this perfection, one must consult Srimad-Bhagavatam, which is understood to be the ripe fruit of the Vedic desire tree (nigama-kalpa-taror galitam phalam).
Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Ninth Canto, Chapter 3 – Text 11
