Go to NAPA. Buy smallest hose clamp available. Wrap around tooth. Tighten until it feels better. Chew away.
Don't sweat losing an upper tooth. Lower teeth can shift and fall over like dominos if there is one missing (over the course of years/decades). That can cause issues down the road.
Not so much on uppers. They 'generally' stay in place compared to lowers.
Missing molars, or premolars, or everything, you will not starve. This is America.
