According to recent studies, it has been concluded that metals like gold, silver or copper mist be used to make a tongue scraper, but copper tongue scrapers are the best and most affordable. This is because of a number of reasons: 1. Copper is toxic to the bacteria in the mouth, it removes them from your tongue and helps you get free of bad breath. 2. Copper provides effective enzymes which help the healthy microbes to survive in your mouth. 3. Copper flushes harmful bacteria from your mouth. 4. Copper efficiently unblocks your taste buds which in result makes you taste food better.