| 摘要 |
A toothbrush head comprises tufts 4, 5 of bristles of polygonal cross-section, and tufts 6 of bristles of sheath-core construction which shows in cross-section as concentric circles. The polygonal bristles enable the cleaning of flat tooth surfaces and gum massage. The sheath-core bristles have a hard core for penetration between teeth and a softer sheath reducing bending. The cross-sections, lengths, profiles, tip shapes and materials of the bristles are extensively described.
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