A propeller with bent blades won’t function properly and is also likely to be unbalanced, which can cause vibrations at high speed that may damage shaft bearings, seals and other gearcase components. If blades are bent or otherwise damaged, the propeller should either be replaced or repaired.
A good repair shop can restore a propeller with very significant damage, often by welding new material onto the affected blades and then grinding and shaping the blades back to original geometry. Because of the higher replacement cost, repairing a stainless steel propeller often makes economic sense. It may be more cost-effective to simply replace an inexpensive aluminum prop.