I am VERY out of shape. so i tried to go for a run, but like after a minute of running my teeth start to hurt.

Question

why is that?

Answer 1

close your mouth when you run

Answer 2

If you ate some sugar before you started running then that is probably the case.

Answer 3

Was it cold when you were running, you might need to see a dentist

Answer 4

Start by walking, you sound like you are dedicated enough to make fitness part of your routine. I am a runner but I also enjoy walking AND an hour of walking every morning is very effective. Set your routine first and as your fitness level increases you will be able to start running the way you want to. Good luck !