| 摘要 |
A toothbrush has, on the brush head ( 1 ), a negative end magnetic pole ( 5 ), lateral magnetic poles ( 6 a,b) of opposite polarities and upper magnetic poles ( 7 a-c) which have alternately opposite polarities, that of the foremost magnetic pole ( 7 a) differing from that of the end magnetic pole ( 5 ). The field strength at the surface of the toothbrush is between 600 and 1500 Gauss in the vicinity of a magnetic pole. The magnetic poles ( 5, 6 a,b, 7 a-c) are produced by magnetic plates ( 4 a-f) integrally cast close to the surface. Instead of being let directly into the brush head, the magnetic plates can also be let into an attachment which can be pushed onto a conventional toothbrush.
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