Hi! I'm a current dental student at UMNSOD. I would suggest sending a letter of intent if you don't receive an acceptance on or shortly after decision day (Dec 15th this year, I think?). If you feel you have a strong resume and did well during your interview, I wouldn't say that you should send one prior to then. Others may disagree, but that's just my opinion. If you choose to send a letter of intent, make sure you state why you want to attend the U of MN. Our school values research and community service, do you? If so, highlight that! Learn about the work being done here, what does our school have that you find so attractive that other schools may not have? Consider these things prior to writing a letter of intent. Good luck!