Without an xray and an exam it is difficult to determine but just based on what you are describing there is a very high chance that the extent of the existing filling is too large and may warrant for a more indirect restoration like a veneer or a crown. Also the occlusion (Bite) needs to be checked and adjusted as necessary.
Hope this helps.
Devang Shah, DMD
The longevity of fillings is determined by the size of the cavity, the amount of remaining tooth structure, the structural integrity of the tooth, and the kind of forces that the person puts on the tooth both through normal chewing/biting forces and parafunctional forces (activities done with the teeth that are beyond the normal purposes of masticating and talking).
Depending on your situation, a filling may be the best and most conservative way to restore the tooth if there is ample remaining tooth left and forces applied to the tooth are low to moderate. While veneers and crowns are strong and long lasting restorations, they should be utilized as last resorts when other treatment options have failed or there is insufficient remaining tooth left or the biting or parafunctional forces are too high. Healthy tooth most of the time needs to be removed to do veneers and crowns. And once a dentist cuts away part of a tooth, it is gone forever. Sometimes, though, it is necessary.
I know this doesn't directly answer your question. But in all honesty there are many variables to consider when we restore teeth. It's not just "drill and fill". Keep your treatment as conservative as possible until you have to upgrade.
Michael I. Farr, DMD, FICOI
I hope that this helps.
Restorations on teeth are subject to so many elements in the mouth. Composite resin restorations are the most commonly used restorative materials on teeth. They are bonded to teeth and over time, the bonding breaks down and deteriorates, allowing for entry of bacteria between the composite and the tooth. This results in the staining that we see around restorations.
The average life span of composite resin restorations on teeth are between 8-15 years depending on many variables such as your oral hygiene and salivary make up. Some patients finds that their restorations require replacement more frequently as a result.
Some restorations can be polished to prolong the time before it requires replacement. Depending on the size and extent of the restoration, a veneer or a crown on a tooth may provide a more definitive restoration for the tooth. But even then, a veneer or a crown may also require replacement in the future.
The most important and best thing one can do is good oral home care and regular maintenance dental appointments for prevention.
Dr. David Wagner
Look forward to seeing you,
Dr. Warren Johnson