Your options for replacing a single tooth:
Removable prosthesis used to be the norm for replacing a missing tooth. Dentists would also shave down adjacent teeth to create a fixed bridge.
Nowadays, dental implants can be used to fill this space without having to modifying the adjacent teeth.
An implant can be placed in the jawbone and topped with a crown so the implant looks just like a real tooth. This solution is both aesthetic and long lasting.