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If you get a cavity under an existing bridge you will need to have the entire bridge replaced with a new one or have a dental implant placed. If you choose a dental implant for the missing tooth you will need two new crowns for the teeth that supported your old bridge. Good luck.
Usually bridges need to be replaced at least every 10 years, there are some exceptions, but imagine something working 3 times a day 365 ,with stress, so there is always a chance of needing an adjustment, also receding gums, can cause a cavity on the root of the tooth, seeing there is a cavity it's time to change it, you should think about getting a dental vacation, relaxing and changing that bridge,for a new one.
Typically a resin bonded bridge known as a "Maryland Bridge" may be done for front teeth, but on premolars and molars it usually is not an option. The back teeth receive more bite force and a resin bonded bridge is prone to dislodging on premolars. A removable flipper is usually the most...
That is just where the crown ends and the tooth begins. It is probably a tooth that has had a root canal, that has turned dark. That happens sometimes.
The Maryland bridge that was placed 25 years ago was probably made of metal and porcelain. If the supporting teeth are still healthy and in tact, then I would do another Maryland bridge type of restoration. Today it can be all ceramic. This is the simplest and most conservative treatment to do. ...
