Bridges are said to be prosthetic devices which remain fixed. If you have one or multiple teeth missing, dentists may recommend bridges. They are cemented over the existing implants or teeth and removed only by dentist.
Spaces left by teeth which are missing will cause the rest of teeth shift or rotate in empty spaces and cause bad bites. Missing teeth causes imbalance which is intended to cause TMJ (temporomandibular joint) disorders or gum disease.