Decompose cleared smoke dirty naturally, tea be soiled, coffee dirties, the black yellow phenomenon such as tooth bacterium spot. Shine to see in vain see, no matter be smoking,blackening still is the problem such as oral cavity peculiar smell can clear off. Brush namely clean, 30 seconds blossom smile, move start work return immediately you are bright white tooth. Edge tool of beautiful white tooth, abiding bright white, leave yellow smoke tooth, pure and fresh and natural.