Hello everyone! My baby is 7 months old and still has no teeth, although…

Hello everyone! My baby is 7 months old and still has no teeth, although we've been struggling with it for 4 months now. He keeps trying to put everything in his mouth, chews on his gums, and gets fussy. This morning I found a small stripe on his gum, similar to a scratch, though he didn't try to bite anything that could have scratched him. Does this mean it will happen soon? What age did your babies get their first tooth?