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Skin, because you have the skin on your hands and body so, you will be touching with you skin.
The outer layer is continually being worn away and replaced, but the deeper layers (that do the replacing) are yours forever. (Well, for at least 7 years.)
The human skin is not replaced every 40 days. It is believed that the skin is replaced on average every 35 days.
Skin
Yes. The outside layer is dead, but when they fall off, it's replaced by the skin underneath it.
It is possible that your skin would get too dry and crack. Some people with Obsessive Compulsive Disorder who wash their hands continually will get such problems.
He was prone to skin infection and often wore kid gloves to protect his hands.
The skin is always shedding and has to be constantly replaced from lower layers. The teeth are not being replaced. They are eroded and not rebuilt as we age.
Yes
skin is thicker on your feet
its called a skin graft
-> The skin is often of a different thickness there, and has more blood vessels. That changes the darkness of the skin. You can see something similar elsewhere on your body. Unless you have very pale skin, the skin on the palms of your hands and the soles of your feet will be lighter than your other skin. This is all normal and nothing to be concerned about.