Restorations sit on a spectrum from a small filling to a full crown, and the choice, along with what happens after it is placed, is what these answers address. Defect size, cracks, remaining structure and bite determine whether a filling, an inlay or onlay, or a full crown is appropriate. Each preserves a different amount of the tooth. No single material or fixed lifespan applies to every crown; margin quality, bite forces and decay risk matter more than a stated average, and a crown can still fail if the supporting tooth fractures or decay forms at its edge. A crown coming off repeatedly points to a specific cause, limited tooth height, cement failure, bite forces or fracture, that needs identifying before it is simply recemented. Bridges and implants trade differently on preparing adjacent teeth versus surgery.
And decisions like replacing a sound amalgam filling or adding a post to a root-treated tooth should follow a specific clinical finding, not the material or the procedure itself.
Questions people ask
Common questions
6 questions, each answered on its own.
01Does getting a crown damage the tooth?
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A tooth-supported crown requires removal of tooth structure, which is why the indication matters. When a tooth needs substantial protection or reconstruction, that tradeoff may be reasonable. Ask why a more conservative option is or is not appropriate.
02Can decay form under a filling or crown?
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Yes. New decay can develop at restoration margins when plaque, diet, dry mouth and other risks are present. Regular examinations and daily cleaning remain necessary even when the restoration itself is intact.
03What is a core build-up and why is it charged separately?
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A build-up replaces missing tooth structure beneath a crown so the prepared tooth can retain it. It has its own procedure code, which is why it can appear as a separate line, and plans differ on whether they treat it as separately payable or as included in the crown. Ask before treatment whether it is inside the quoted fee, and include both codes in any pretreatment estimate so the plan tells you in writing how it will be handled.
04Why do I need a temporary crown?
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It does more than fill the gap. It protects the prepared tooth, which is exposed and sensitive; it stops adjacent and opposing teeth drifting enough to affect the fit of the final crown; it shapes the gum; and it lets you test appearance, speech and bite before anything is finalized. That last function is the one most people waste. Concerns raised while the temporary is in place can be built into the final restoration far more easily than afterwards.
05Should I replace a silver filling with a white one?
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Replacing a sound, well-sealing amalgam filling purely because of its material means removing tooth structure for no clinical gain. Every replacement cycle removes a little more. Replacement is indicated where there is decay, a fracture, a failing margin or a genuine cosmetic reason you have weighed. If replacement is proposed, ask what specifically is wrong with the existing restoration. The answer should be a finding instead of the material itself.
06Why did my dentist take an impression or scan more than once?
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Usually because the first did not capture what the laboratory needs: a margin obscured by tissue or moisture, a distortion, or a bite record that did not reproduce accurately. It is a normal occurrence instead of a sign of error, and it is far better than proceeding with a record that produces a poorly fitting restoration. If it happens repeatedly, it is reasonable to ask what is making the area difficult to capture.
Evidence record
Sources and answer scope
- Oral Health TopicsAmerican Dental AssociationAccessed 2026-08-17
- Dental Amalgam FillingsU.S. Food and Drug AdministrationAccessed 2026-08-17
- Tooth DecayNational Institute of Dental and Craniofacial ResearchAccessed 2026-08-17
- Dental Implants: What You Should KnowU.S. Food and Drug AdministrationAccessed 2026-08-17