Has anyone's LO randomly missed one tooth while teething? Did it come through later?

DD has had most of her teeth for months, but one of the front canines never showed up. I'm not sure what to make of it, but her other teeth came in all out of order and I'm worried they're too close together and getting in the way. I'm not sure if I should keep waiting or drag her to a dentist, and what a dentist would even do about it...