Which material is not considered suitable for jewelry used in body piercings?

Plastic not approved for surgical use is the correct choice because body piercings require jewelry made from materials that are safe and biocompatible to reduce the risk of allergic reactions and infections. Materials such as surgical implant-grade stainless steel, 14 karat solid gold, and niobium are specifically designed for body jewelry; they are resistant to corrosion, do not react adversely with body tissues, and are safe for prolonged contact with the skin.

In contrast, plastic that is not approved for surgical use may contain additives or compounds that could irritate the skin or lead to complications during the healing process. Using unapproved plastics can increase the risk of rejection, inflammation, or infections, making them unsuitable for body piercings. Therefore, it is vital to choose jewelry made from recognized surgical-grade materials to ensure safety and promote healing.