A bridge is held firmly in place by crowning healthy teeth on each side of the missing one(s). You cannot take a bridge out; it is cemented to your teeth. If a tooth is lost, it is important to replace it with a false (or artificial) tooth as soon as possible. This procedure will prevent your remaining teeth from drifting out of line and causing other problems.
Like crowns, bridges can be made of different kinds of metals, porcelain, or porcelain fused to metal. They are strong and last for about 10 years on average, if you take good care of them. Your dentist will show you how to use a floss threader to floss under and around the false tooth (or teeth) in the middle of the bridge.