Final answer:
A trimmer or a clipper is commonly used to remove hair around the ears and neckline efficiently and safely. For chemical hair removal, products like Nair, Magic Shave, and Veet, which are chemical depilatories, can also be used to disintegrate the hair's protein bonds.
Step-by-step explanation:
The tool commonly used to remove hair around the ears and the neckline is typically a trimmer or a clipper. These are electric devices designed for precision and are ideal for these delicate areas. In some cases, for a closer cut, a straight razor might be used by professionals. However, there are also chemical depilatories, like Nair, Magic Shave, and Veet, which are formulated in various forms such as gels, creams, lotions, aerosols, roll-ons, and powders to remove hair by breaking down protein chains in the hair.
While clippers and trimmers provide a physical cut of the hair, chemical depilatories offer a chemical method of hair removal by breaking the disulfide bonds in keratin, weakening hair so it can be easily wiped away. This method of hair removal is considered depilation because it removes hair just above the surface of the skin.