When tweezers get dull - which happens with repeated use - they are no longer as effective as grabbing on to and removing small hairs. You can take them to a knife shop for sharpening. Some of the better brands, such as Tweezerman, come with a lifetime guarantee that includes free sharpening whenever necessary.
Eyelash Curler Care
The rubber pads that line the inside if an eyelash curler are there to protect the lashes, so when the pads start to wear out or break apart, they must be replaced. many eyelash curlers come with a set of replacement pads. Keep a set on hand.