| 摘要 |
For the use of toothbrush to clean the teeth, it is recommended that the head of the toothbrush should be placed beside teeth with the bristle tips at a 45 degree angle against the gum line. Sodium Fluoride or mouth wash are used to fight cavities, tartan and many other gum diseases. In PRAF Toothbrush, rectangular head with rounded edges contains bristles in five rows. They are classified as: Bristle of outer row. Bristles of intermediate row. Bristle of central row. Bristles of all rows Do not have the same length. Instead, inclined cutting of bristles making 45 degree angle with horizontal plane is the unique characteristic of PRAF toothbrush as shown in figure 1 /A 2. Tuft of each row is not rounded end. Instead, it has Tapered End Which is 2nd important characteristic of PRAF toothbrush as shown in figure 4. In PRAF toothbrush, there is passage for flow of sodium fluoride/mouthwash through micro holes located on Head around the bristles. The passage runs along neck and handle. The flow of Sodium fluoride/mouthwash through head of brush is the 3rd unique feature giving this tooth brush a NEW PRODUCT as shown in figure 6 /A 7.
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