[Lorelai sits on the bed looking through her purse while Rory is in the bathroom.]
LORELAI: Ohh, ahhh, I struck gold! [pulling something out of her purse]
RORY: What is it?
Certs is a brand of breath mint and candy made by Mondelēz International since 1956. One of the first mints to be marketed in the US, they are a fixture at drug stores and convenience stores. Despite being mints, they don’t contain any actual mint, just artificial mint flavouring, with their green colour coming from copper.