Tooth supported fixed bridges require the adjacent teeth to be prepared, by grinding them down. A bridge is implanted across your teeth to act as a support structure for the crown. Over time the adjacent natural teeth will be more prone to decay because they have been ground down.
The crown also does not stimulate the bone growth underneath it so some level of deterioration is to be expected. Of course, you do need to have strong supporting teeth for the bridge to be fixed to.
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