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About This Item
ISO 22254:2004 specifies a test method for determining the resistance of the tufted portion of manual toothbrushes to deflection. ISO 22254:2004 is applicable to toothbrushes having a conventional flat trim design and may not be applicable to toothbrushes with other designs. The results obtained with ISO 22254:2004 may not correspond to consumer perceptions of the stiffness of toothbrush bristles.