this tongue cleaner is made up of pure stainless steel metal EFFECTIVELY REMOVES HALITOSIS/BAD BREATH: Wonder Care Stainless Steel Tongue Scraper is very effective in the removal of Halitosis/Bad Breath toxins and plaque from the tongue. They prevent bacteria build-up, thrush, and black tongue (sometimes caused by the use of antibiotics) and remove mucous buildup on the back of your tongue.USE: Simply stick your tongue out, Inhale and hold your breath (to prevent vomit reflex) and gently scrape your tongue back to front, wash the edge with water. Repeat 3-5 times.