Can I leave my nipple rings during surgery if I use plastic rings instead of surgical steel ones?

You may want to ask your plastic surgeon. However, it's usually advised to remove all jewelry before any surgical procedure.

Since you are not having any type of breast surgery you can switch out the metal ones and replace with the plastic rings.  However don't be too worried about them closing.  If you have had the piercings greater than 6 months and there is no inflammation, they will not close.

Infection following breast augmentation can be a devastating
complication that results in the loss of breast implants. For this reason, everything should be done to
minimize the potential for this complication. Nipple
rings not only have bacteria on their surface but within the skin tunnel that
the ring passes through as well.It’s
virtually impossible to eradicate bacteria in this location prior to
surgery.For this reason, we always
recommend that nipple rings be removed when patients undergo breast augmentation.

We just take them out and put them back in after surgery. Simple as that. Please seek out a board certified plastic surgeon

Nipple rings are foreign objects and can harbor bacteria. Any bacteria present in the operative field can lead to an infection. If the implant pocket becomes infected it would be necessary to remove the implant for a prolonged period of time before it can be replaced. In order to increase the safety of the procedure and help ensure an uncomplicated recovery it would be best to the remove nipple rings before your procedure. Good luck.