How to Fix Loose Earrings
EARRING BACKS THAT ARE LOOSE
The butterfly backs for earring posts may become loose with everyday wear. To make sure you don't lose your favorite earrings, make sure the earring backs feel secure.
If your butterfly backs feel loose, with your fingers, gently squeeze the two circle metal back parts together. The circles will then close together and make the grip on your earring post tight again.
Its always beneficial to have some back ups.
Another option is to purchase silicone backs, which are more secure and have more grip. It’s also much more comfortable for those who wear their earrings to sleep.