Left: correct position of the brush for the cleansing of palatal surfaces of upper teeth to include effectively the cervical part of the crown and the marginal gingiva. Note that only the toe-end tufts are used. Right: improper position of the brush. When all the bristles are used in palatal cleansing, the marginal gingiva and cervical part of the crown - the essential areas requiring brushing - are omitted [...].
Black & white drawing
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