Vibhuti (Sanskrit: विभूति; vibhūti), also called Bhasma (ash), Thiruneeru and Vibhooti, is a word that has several meanings in Hinduism. Generally, it is used to denote the sacred ash which is made of burnt dried wood in Āgamic rituals.
Hindu devotees funngti traditionally as three horizontal lines across the forehead and other parts of the body like shoulder joints, elbow joint, wrist and chest. This is applied to please Lord Shiva. Vibhuti smeared across the forehead to the end of both eyebrows is called Tripundra.
There is a scientic reason for Vibhuti to be applied. As i had mentioned in my previous posts about Ponds in temple are used as bath houses. People those days take bath in the temple pond. When they take bath in the pond, their head and hair gets wet. They did not have shower caps to protect their head from getting wet. Immediately after bath they come into the temple for worship. They believe that they are giving themselves to the God in the purest form. In return, the temple give vibhuti to apply on forehead. This has been done for their health. The ash that is given is created from a wood that has lots of medicial nature. The ash when applied on the forehead obsorbs the extra water content that has gone into the head during the bath. This will keep them away from cold, fever and other unnecessary diseases that comes due to having wet hair for a long time. As mentioned in the previous paragraph it is applied only in the joints, forehead and chest.
Do you remember the Vicks advertisement?
where does the mother apply vicks to the child who gets wet in the rain? In the forehead, chest and nose. This exactly has the same effect.
So apply Vibhuti is good for your health. It is a natural product.