Answer:
What dentists battle on a daily basis
What has a head, a tail, is brown, and has no legs?
This is a pearยญshaped fruit with a rough leathery skin, smooth oily edible flesh, and a large pit in the center. It is most used in guacamole dip
What can touch someone once and last them a lifetime?
A mechanism to discover who is following you.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.