Crown or Filling: Which Does Your Tooth Actually Need?
For anyone weighing a crown against a filling, this page explains the decision rule (how much sound tooth wall is left), compares the two side by side, points to onlays in between and gives fees and lifespans. In general, a filling may suit a tooth with strong walls, and a crown is considered when too little tooth remains to protect it.
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Medical disclaimer: This page is for general information only. It does not replace an examination or treatment by a dentist.
Dr Ibraheem Ijaz, principal dentist at Deepcar Dental Care, reviewed this page. He is a General Dental Practitioner, GDC 301711, and his registration can be checked on the General Dental Council's online register.
What decides whether a tooth needs a crown or a filling?
In general, much of the decision rests on how much sound tooth is left, especially how many side walls remain and their thickness. Whether the tooth is root-filled, the forces on it, grinding habits and appearance also count (Abu-Awwad, 2019). Bristol Dental School's patient guide explains that fillings can build up lost tooth tissue but will not reinforce the structure of a tooth as a crown would.
How does wall thickness come into it?
A 2019 survey of 120 dentists (Abu-Awwad) used a wall thickness of 2 mm as its dividing line on crack-free model back teeth, assuming no grinding. For a living molar (one whose nerve is alive) with a cavity only in the biting surface and walls of 2 mm or more, 95% said the cusps, the raised points of the tooth, did not need covering. For a living molar with a cavity through one side and walls under 2 mm, 67% said they did, 30% said not and 3% were unsure.
Surveyed dentists disagreed most, and were least sure, about living teeth and about teeth with a moderate amount lost. So the wall rule is a starting point for judgement, not a fixed cut-off: it is reasonable to ask which walls are thin, whether there are cracks, and why a smaller restoration would not work.
How do a crown and a filling compare side by side?
A filling repairs a hole; a crown covers the whole tooth, which must first be shaped (NHS), and reinforces a weakened tooth (Bristol). Neither option wins on every measure. In general, they compare like this:
| In general | White filling | Crown |
|---|---|---|
| What it is (NHS) | A repair for a hole caused by decay | A cap that completely covers a real tooth |
| Preparation | Filling site cleaned and shaped (Bristol) | The tooth is shaped so the crown can be fixed on to it (NHS) |
| Commonly used for (Bristol) | Mostly cavities from decay; can also repair cracks and fractures | A lot of tooth missing, a large filling needing protection, a root-filled tooth needing a strong restoration, or a failing crown |
| Main risks (Bristol) | Can roughen, discolour, chip or fracture over time | The nerve may become inflamed and die (approximately 20% where the nerve is present); gums can recede to show the edge; porcelain can fracture |
If the nerve dies, Bristol Dental School says root canal treatment or extraction is needed. In a laboratory study on model back teeth (Edelhoff and Sorensen, 2002), full crown preparations removed about 67.5% to 75.6% of the tooth above the root; fillings were not measured.
At Deepcar Dental Care, the two compare like this:
| At Deepcar Dental Care | White filling | Crown |
|---|---|---|
| Realistic lifespan, depending on the individual patient, their oral hygiene and their habits | 5 to 10 years | 5 to 20 years |
| Aftercare cover | 12 months: free repair, free replacement or remake, free adjustments | 12 months: free repair, free replacement or remake, free adjustments |
The 12-month aftercare cover applies to fillings, crowns and bridges, dentures, and porcelain veneers; it does not apply where damage results from accidental trauma or infection, and for dentures, gum recession is also excluded.
When is a filling enough?
In general, a filling may be more suitable when the cavity is not very large and thick walls remain, because it repairs only the hole. Bristol Dental School's guide says a white filling is not appropriate when it is difficult to keep the tooth dry, when the cavity extends near or under the gum, or when the cavity is very large.
At Deepcar Dental Care, white filling appointments take around 60 minutes. How a white filling is placed is explained on our page about white fillings, and how a cavity's depth shapes its repair is covered on our page about what a hole in a tooth means.
When is a filling not enough?
In general, a crown or onlay may suit a tooth with a lot of structure lost or thin walls, because covering the cusps protects it.
For living back teeth, a 2017 systematic review (Afrashtehfar and colleagues) found a clear link between less remaining tooth and more failed restorations. In teeth with fewer than 2 remaining walls, high-quality observational studies showed crowns doing better than amalgam (silver) fillings, and trials found amalgam did better than composite whatever the tooth left, but the authors judged high-quality data insufficient to favour one treatment or material. Our page on having a crown fitted explains the process.
At Deepcar Dental Care, a crown takes 2 to 3 visits, with around 1 week from preparation to fitting, and a temporary is provided in most cases.
What changes after root canal treatment?
For a root-filled back tooth, the British Endodontic Society's guide is firmer: losing a whole wall significantly weakens a tooth, leaving it susceptible to fracture under biting forces, and a cusp-covering restoration, such as a crown or onlay, is required in most cases once one or more side walls are lost. Each case should still be considered individually; where only the biting surface is involved, with adequate thickness of all remaining walls and no cracks, cusp coverage is not likely to be required, and restorations should keep as much sound tooth as possible.
The studies, all on root-filled teeth rather than living ones, are mixed. A 2018 meta-analysis (Shu and colleagues) found higher 5- and 10-year survival with indirect restorations, mostly crowns, but no difference in restorative or root canal success up to 5 years, and made only a weak recommendation from very low to moderate quality evidence. A 2015 Cochrane review, with one trial of 117 premolars, found insufficient evidence to judge crowns against fillings. Front teeth and timing are covered on our page about crowns after root canal treatment.
To ask about a crown or a filling, book online or call 0114 288 2121.
Where does an onlay fit between a filling and a crown?
An onlay sits between the two: it covers one or more cusps without covering the whole tooth. Bristol Dental School's guide says onlays can be used for teeth with a larger amount of natural tooth left. Options at Deepcar Dental Care include composite and ceramic inlays and onlays, each taking 2 visits. Our page on inlays and onlays for larger cavities explains them, and a crown and an onlay compared weighs those two side by side.
How do the costs of a crown and a filling compare over time?
On the current fee list, the white filling line is lower than the ceramic crown line. The Deepcar Dental Care fee list, checked on 25 October 2026, prints "White Composite Filling £150 - £220" and "All Ceramic Crowns & Veneers From £750 - £1000".
At Deepcar Dental Care, the realistic lifespan range is 5 to 10 years for a white filling and 5 to 20 years for a crown, depending on the individual patient, their oral hygiene and their habits. NHS guidance notes that crowns may need replacing in the future, and Bristol Dental School says white fillings need maintenance. The restorative cost page sets out what it costs to restore a tooth in other ways.
What other restorative choices are compared?
Crown or filling is one of several restorative decisions, and the options in this section set others side by side. Our decision guide helps with working out which option suits, and both treatments belong to repairing and rebuilding damaged teeth, saving natural teeth rather than replacing them with implants.
Frequently asked questions
Is a crown better than a filling?
Not as a rule. Bristol Dental School's guide says a crown reinforces a heavily broken down tooth, but the tooth must be shaped to fit it, which carries risks such as damage to a living nerve. Where the walls are strong, a filling may be enough.
Is a filling or a crown cheaper on the NHS?
In England, NHS Band 2 (£76.60), which may include fillings, costs less than Band 3 (£332.10), which may include crowns. A course needing both is charged at the higher band, NHS guidance says, and some people can get free treatment or help with part of the cost.
Can a tooth with a large filling have a crown later?
Yes. Bristol Dental School's guide lists a large filling that needs further protection among the common reasons for a crown. Whether an existing filling should stay or be replaced, and with what, depends on the filling and the tooth around it.
Is the tooth numbed for a crown and for a filling?
Bristol Dental School's guides say a tooth may be numbed with local anaesthetic for a filling and is numbed for crown preparation. Some pressure while a crown is cemented is normal, the crowns guide adds. At Deepcar Dental Care, topical numbing gel is applied before every injection.
Will a crown or a filling match my other teeth?
A white filling can be matched to the colour of your tooth, Bristol Dental School's guide says. Crowns can be made from materials including metal, ceramic or a combination of the two, and the guide suggests talking through each material's advantages and disadvantages with your dental professional before choosing.
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You can contact Deepcar Dental Care online or by phone. The practice is at 334 Manchester Road, Deepcar, Sheffield, S36 2RH, open 8am to 8pm, Monday to Sunday, with free parking directly outside. No overseas laboratory work is used. Patient feedback is on the practice's reviews page.
334 Manchester Road
Deepcar, Sheffield S36 2RH
0114 288 2121
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