Tips: AIf you are using it for the first time or after multiple uses, it is recommended that you wash it first with hot water or lemonade AIt is recommended to use it twice or three times a week ADuring the first few days of using the tongue scraper may in some cases provoke a feeling of nausea This feeling will disappear with time, please dont worry ADo not use the tongue scraper too deep into the root of the tongue, to avoid the sensation of vomiting cause by simulation AKids should use it under parental supervision Package list: 4* Tongue Scraping cleaners (green & Blue & Orange & Black) 4* Portable Traveling carry cases