Implant failure is possible. Before placing implants, your dentist should do a 3D scan and evaluate bone strength and do a bone graft to avoid any complications.
I’m excited for you to get your implants as they are the best way to replace missing teeth currently. Although implants have gotten more predictable and success rates are high, implant failure is still possible unfortunately. Most important aspect of a successful and long lasting implants is a healthy bone. As long as the procedure is done properly and correctly, and you take good care of it with proper oral hygiene and regular dental cleanings, it should not be a huge issue. It will be worth all the efforts!