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Decayed tooth is the nightmare of most children. The tooth plays a very important role in people's life, but the dental protection often neglected in infant. It's designed for 3~5 years old children, which through three kinds of the brushes transformation, separately test the plaque, and PH values in the mouth. At the same time it kept the function of the basic toothbrush too. When the PH values brush has changed, children can learn the correct dental protection through the color change of interface. It is designed with imitating biological and brightly color.