If I am missing several teeth, do they each have to be replaced with a separate implant?

No. If you are missing several teeth they do not each have to be replaced with a separate implant. Although implants are artificial roots, one implant can be used to replace one or more teeth by way of attaching bridgework to the implant. Each patient's needs vary and the number of implants needed for any particular patient will be determined by a number of clinical factors.