Is it for sanitary reasons or because the first needle slightly gets dulled?
If it slightly gets dulled from the rubber is it such a big deal you Need to change it or is it just a good rule of thumb for calves and very painful spots?
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Is it for sanitary reasons or because the first needle slightly gets dulled?
If it slightly gets dulled from the rubber is it such a big deal you Need to change it or is it just a good rule of thumb for calves and very painful spots?
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