Hello,
To answer your questions :
Yes, the composites can be re-done. They can be re-done immediately in case they break, you don't need to wait for any particular time.
Yes, you may face sensitivity issues if you get them give again and again, since everytime we have to redo it, there is a little bit of grinding of the tooth required
Next Steps
if they are done well, they usually don't break or fracture that fast, also maintaining them is in your hands.