I would recommend replacing them for two reasons.

1. They are probably out of balance now. Which will make the heli not perform at its best.

2. There is a lead weight in the tips of the blades. If you continue to fly it, its possible that the lead weight will "sling" out of the blades. If it does it becomes a VERY fast moving metal projectile. I did this with my flat blades, and the thin lead weight put a dent in the wall. Im just glad it didnt hit me. Also the lead weight is a thin rod about 3" long. Which is like a flying lead needle if it comes loose. As we all know lead and the human body dont mix.