It is generally not so easy to oxidize. The brand that can be bought after the ear hole grows needs to be cleaned for free. Although sweat will make jewelry not bright enough, it is not afraid of oxidation as long as it is cleaned frequently. Moreover, 18k mainly contains 75% gold, and precious metal jewelry generally does not cause allergies. As long as the earrings are kept clean, be careful that the earplugs at the back are not too tight (too tight will make the ear holes airtight, breed bacteria and cause allergies). Mei Mei, this is my sister's major. Sister has played so much, give me some points. Thank you for digging.