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It's often heard in dentistry that you shouldn't bend needles as it will weaken them and cause them to break. This video of a 27G needle demonstrates that a needle can be bent up to 22 times before it finally separates.

Needles generally separate at the shank.

If bending a needle, proper technique involves using cotton pliers or something other than your fingers.

I bend needles routinely to help me access various areas of the mouth more easily.

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