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Tooth's attrition is because of the toothbrush we use and the way person's routine cleans the teeth.
Now in the market toothbrush's design (e.g. Figure 1) causes people get used to clean the teeth right and left, this will create massive attrition for the tooth.
This toothbrush's design (e.g. Figure 2) causes people to brush their teeth up and down, if they still do it right and left it will be a misoperation, the head of the toothbrush will move.thus cause the human to clean the teeth up and down, and change the way of clean tooth gradually.Finally, reduce tooth's attrition and protect the tooth.