How do you straighten cupboard doors?

To straighten cupboard doors, first, check for any loose hinges and tighten them as needed. If the doors are still misaligned, adjust the hinges by loosening the screws and repositioning the door until it is level and aligned with the cabinet frame. For warped doors, consider using a heat source, like a hairdryer, to slightly soften the wood, then gently bend it back into shape, securing it with clamps until it cools. Finally, if necessary, replace or add shims behind the hinges to achieve the desired alignment.