To Prevent Infection: Clean both of your ears and all earrings with alcohol Before and After wearing them. Do not put Hydrogen Peroxide (or any Bleach) on any Silver jewelry....You Should Clean Your Earrings as Often as is Possible. To Remain Safe and Sound, Clean Your Earrings Once a Week Especially If You Wear the Same Pair All Week. Be Careful to Not Push the Back Post On Too Tight...Silver is a material that would naturally brownish, tarnish, oxidized, but clean it is not as different as we think. Use silver cleaning Polishing cloth is one of the best and easy way to clean your tarnished or oxidized silver jewelry.