You can't deny the fact that your wedding band will catch impurities and dirt that can reduce its sparkle. What you can do is, get your 3mm gold wedding band checked occasionally and cleaned professionally to maintain its sparkle and enhance its longevity.
Cleaning gold wedding bands is a lot easier as compared to cleaning diamond jewelry. No matter the type of metal used in the 3mm wedding band, the professional methods use detergent-free soap and chemicals to clean the band. Polishing is also done to make the wedding bands look clean and shiny.