"Lifetime Oralcare"-Interview
Wearing a dust-free hat and dust-proof clothing, Lucy adjusted the electronic magnifying glass and stared at the image on the computer.In the picture, the blue-green filaments are neat and round. "If the bristles are too long, they will not be clean; if they are too short, they will be hard and easily pierce the gums." Lucy talked about the complexity behind the small toothbrush....
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