I recommend the Dr. Tung's tongue cleaner.

I recommend the Dr. Tung's Tongue Cleaner. I bought this at Olive Young, and unlike regular tongue cleaners, it has a U-shape, so it is great because it doesn't make me gag even when cleaning the back of my tongue!! Also, as shown in the second picture, it comes with a pouch, so I recommend it because it allows for hygienic storage. Although it is on the expensive side for a tongue cleaner, I am quite satisfied with it.