Most orthodontic instrument manufacturers recommend that you sharpen or recondition your orthodontic pliers and instruments every 6-9 months. This will ensure that your instruments remain in tip-top shape and perform the way they are intended to.
That said, if your orthodontic cutters and instruments are performing well go ahead and continue to use them. If you notice that your distal end cutters are no longer holding wire securely in place after cutting then it’s time to service your orthodontic instruments. If your pin & ligature cutters are no longer cutting precisely at the tip, crimping the wire, or you experience play or a wobble in the hinge then it’s time to service your orthodontic pliers.