Fixed bridges are used to replace one or more missing teeth they literally bridge the gap left by missing teeth. Fixed bridges cannot be taken out of your mouth as you might do with removable partial dentures. Bridges are used to improve the look and function of the teeth.
When a tooth is missing there is always a chance that the surrounding teeth:
Will naturally shift to fill the empty space
There is also a chance that decay may occur in the surrounding teeth
speech impediments may occur