Scrape first thing in the morning, before you eat or drink, to remove the bacteria that has accumulated on your tongue overnight.
Copper will naturally oxidize over time. That’s what will give it its beautiful, unique look. Just make sure to keep rinsing the Tongue Cleaner with water after use and all will be well. If you do want to keep it shiny and bright, rub a mixture of white vinegar and table salt onto the Tongue Cleaner with a cloth and rinse.