KaVo INTRAmatic Contra-angle 23 ES 1.004.5380 Instructions For Use Manual page 29

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CAUTION
Hazard from insufficient spray water.
Insufficient spray water can cause the medical device to overheat and
damage the tooth.
▶ Check the spray water channels and clean the spray nozzles with the
nozzle needle Mat. no. 0.410.0931 if necessary.
▶ Check the water filter and exchange if necessary.