<p>You shouldn’t change your teacher! You can make a new version of your Common App and re-add your teacher, OR - use your old common app, and click invite official. Then, just re-add your teacher. If CA gives you any bs, add in your teacher’s middle initial to his/her name so it’s “different.” If the worse comes to worse, have your teacher hand-write the rec and mail it in. Let me know if you have any questions! :)</p>