Dentist removed tooth but left the root. He just said it would fall out anyway. Can I get an implant with an open bite?

Grafting is to prevent facial changes from collapse or bone resorption (or to add a couple mm to place an implant). After collapse, only a reconstruction can make drastic changes. This would normally be done with a facial reconstructive plastic surgeon and without seeing photos, models and all...

If there is no space, there is no place for an implant.  Opening space FOR an implant can be very complicated, so finding the right orthodontist or dentist may be a challenge.  This will take considerable time and patience but will be worth it in the end.

The implant screw itself is made of titanium and it's very strong. your bone will probably fracture before the implant itself does. but the crown that's sitting on top and the attachments to the implant can break in trauma. if you are having discomfort you should have it checked for sure.