Tongue scraping has been used in India since ancient times.
Using a tongue scraper to clean the tongue every morning is an effective way to remove the bacteria that coats on  the tongue each night causing bad breath. Daily tongue scraping  leads to fresher breath and also removes  toxins before they can get absorbed into the system.
Tongue scrapers made from materials such as copper, silver and brass are more effective according to Ayurvedic literature. 
How to use:
Use the tongue scraper daily before eating & brushing your teeth in the morning.
Wash the tongue scraper with warm water. Place the curved part of the scraper at the rear of tongue and scrape outwards.
Scrape gently about 3 to 5 times until the tongue is clean. For the first few times use only once or twice until you get comfortable with it.
 Rinse your mouth and scraper after use.