NSK SGS Serie Mode D'emploi page 17

1) Clean the external surface of the handpiece with a soft bristled toothbrush for 15 seconds or more.
(Fig. 11)
2) Clean the interior cavity of the handpiece for 15 seconds or more, using an interdental brush (wire thickness
0.7mm) that conforms to size 4 in ISO 16409. (Fig. 12)
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Fig. 11
Fig. 12