Just wondering what would happen. Also what happens if your teacher hasn’t completed their recommendation by the due date? Can they submit it late without any penalities?
What happens if you submit your CommonApp before your Teachers have completed their recommendations?
Have you talked to your Guidance Counselor? The teacher might need to be nudged by the GC.
Your application would be pending awaiting final documents.
For most colleges, nothing. They generally give a few days grace period for things not in your control, like recs and scores.
One reminder might be fine, but I really doubt this is the teacher’s first rodeo; s/he knows the drill.