关于保护牙齿的 英语短文
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The invention provides a method for permanent teeth protection and teeth improvement. After careful teeth clearling and correction, it is required to make a smooth cover tallied with the original tooth, and combined with filling of tooth if necessary. Then stick the cover on the original tooth by parts or as a whole, so as to eliminate any seams existed to stuff with filth. The cover, together with the original tooth will form a smooth and firm intergrated tooth. By this, all the shortcomings of conventional dental trcatment will be done away with, and the human teeth will be permanently protected in a simple and effective way. This technique is very helpful to improve
