How should running shoes fit?
Try re-lacing your shoes and make it more loose than they were previously laced. Hopefully your shoes will feel more roomy how you like them! If not, then you should be able to take your shoes back if you haven’t ran in them. I would suggest going to a running center next time to have someone fit your shoes for you and to watch you run in them so you ensure to get the right fit! But about your other question: Your feet swell up a little while you run. So if your toes are touching the edge of the shoe before you even start running, then you are risking getting a range of injuries, such as: blisters, ingrown toenails, toenails falling off (seriously!!), shin splints, etc… So your toes should have some room at the front. The way my shoes fit are the little toes have about a thumb of room space and the big toe has no bigger than a pinkie size of space. That’s just the way I like my shoes to fit; other people may vary. And people’s hand sizes vary, too… haha.