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Cavities and tooth decay are among the world's most common health problems. Ordinary toothbrush inconvenient to carry, and likely to have health problems.
The length of handy brush usually is like a credit card, only half the width, quite easy to carry. Just a little push, bristles width becomes normal size. The bristles of handy brush are string of consecutive repeat unit. It is easy to manufacture, and easy to replace. The slope at the end of the shell can avoid accidental disintegration.
National Yunlin University
Yunlin County, Taiwan
Changhua County, Taiwan