I've tried literally zillions of lip exfoliators, from cheapie to high end, and I keep coming back to Laura Geller's Lip Strip. IMHO, it's the best lip scrub there is.
Just wet your lips, put a dot on, and start scrubbing. This is a sugar exfoliator with a hint of mint. The sugar evaporates while getting rid of flakes, and leaves a yummy taste. The mint is there, tasty, but not overpowering. The scrub washes away quickly and easily, and it leaves behind a moisturized feeling your mouth will love.
One other thing: this is probably also THE best buy in history. I had two large foil samples of this and used it every day for three months. A little goes a LONG way! Trust me, after using this, your lips will be flawless!