Do you really need a crown?
A crown is a good repair for a badly broken tooth and an expensive one for a healthy tooth. The question is which of the two you have.
Medically reviewed by Dt. Hüseyin Yavuz Özbek, implant surgeon · Updated October 2026A crown is justified when a tooth has lost so much structure that a filling cannot hold it together, after some root canal treatments on back teeth, or when a large old filling keeps failing. For small decay, chips, gaps or colour, a filling, bonding, an onlay or a veneer usually keeps far more tooth. Preparing a tooth for a full crown removes roughly 63% to 72% of the visible tooth in laboratory studies, so it is worth being sure first.
Crowns have a reputation problem. On one side they are a solid, well-tested repair for teeth that are falling apart. On the other, they have become a cosmetic product, and plenty of people now have crowns on teeth that only needed a filling, some whitening or nothing at all. Before you book one, it helps to know what a crown does to a tooth and which situations really call for it.
What a crown costs the tooth
A crown covers the whole visible part of a tooth, so the tooth has to be reduced all the way round to make space for it. A well-known laboratory study measured how much tooth was removed for different preparations on front teeth. Veneers and bonded bridge wings removed roughly 3% to 30% of the crown of the tooth by weight. Full crown preparations removed about 63% to 72% (Edelhoff and Sorensen, 2002). A companion study on back teeth found the same pattern: inlays, onlays and partial crowns took less, full crowns took the most.
That lost tooth never comes back. It also affects the nerve. A survey of crowned teeth on X-rays in Scotland found that about 19% of crowned teeth that still had a live nerve showed signs of disease around the root tip, and the authors concluded that preparing a tooth for a crown can damage the pulp and lead to root canal treatment later (Saunders and Saunders, 1998). Not every crowned tooth runs into trouble, but the risk is real enough to count.
Our page on what happens to your teeth under a crown explains the preparation step in more detail.
When a crown is the right answer
None of that means crowns are bad. For some teeth they are the most sensible repair, and the alternatives would fail. The usual reasons are:
- Too little tooth left. When decay or a fracture has taken away most of the walls, a filling has nothing to hold on to. A crown holds what remains together.
- A back tooth after root canal treatment that has lost a lot of structure. These teeth tend to be more brittle, and covering the cusps protects them. Our article on root-filled teeth goes through when that applies.
- A large old filling that keeps breaking or a tooth with cracks running under the cusps.
- Replacing an existing crown that has failed. Once a tooth has been crowned, it normally needs a crown again.
- Supporting a bridge where a neighbouring tooth is missing and an implant is not the plan.
The Oral Health Foundation and the NHS describe crowns in similar terms: for teeth that are broken, decayed, weakened or heavily filled, as well as for appearance in some cases.
When something smaller does the job
A filling
Small or medium decay, or a lost piece of filling, can usually be repaired with a tooth-coloured filling. It removes only the damaged part. If the filling fails later, a crown is still possible, so you lose nothing by trying the smaller option first.
An onlay or partial crown
When a back tooth has lost a cusp or two but the rest is sound, an onlay covers the weak part and leaves healthy walls alone. A systematic review of ceramic and resin inlays, onlays and overlays estimated survival of about 92% to 95% at five years and 91% at ten years (Morimoto and colleagues, 2016). Our article on onlays and partial crowns covers who suits them.
Bonding
For chips, small gaps, worn edges or odd-shaped front teeth, composite bonding is added to the surface with little or no drilling. It does not last forever. A systematic review of front-tooth composite restorations found annual failure rates between 0% and 4.1% across studies, with fracture the most common reason (Demarco and colleagues, 2015). The advantage is that a chipped composite can usually be repaired or redone without touching more tooth.
A veneer
If the issue is mainly colour or shape on a healthy front tooth, a veneer covers the front face and takes much less tooth than a crown. See crowns vs veneers for the trade-offs.
Nothing
A small stain, a shallow crack line in enamel or a tooth that has been slightly sensitive for years without getting worse may need no treatment at all, only monitoring. Whitening can also change the look of teeth without any drilling.
A quick way to sort your situation
| Your tooth | Usually considered first | When a crown comes into it |
|---|---|---|
| Small decay or small chip | Filling or bonding | Rarely |
| One or two cusps broken on a back tooth | Onlay or partial crown | If the remaining walls are thin or cracked |
| Most of the tooth gone | Crown, sometimes with a core build-up | Usually yes |
| Root-filled back tooth | Cusp coverage (onlay or crown) | Often, depending on how much tooth is left |
| Healthy front tooth, colour or shape only | Whitening, bonding or veneer | Rarely the first choice |
| Old crown failing | Replacement crown | Yes |
This is a general guide. The final answer depends on your X-rays and on looking at the tooth.
The cosmetic crown question
The difficult cases are healthy teeth that someone wants to look different. Full sets of crowns are sometimes sold as the quickest route to a bright, even smile. The quick route has a long tail: every crowned tooth will need a new crown at some point, and some will need root canal treatment. If you are in your twenties or thirties, that matters even more, because you will live with those teeth for a long time. Our article on crowns in your 20s and 30s looks at that in detail.
Sometimes crowns are still the sensible cosmetic choice, for example where several teeth are already heavily filled or crowned and the healthy ones are few. The point is that the decision should be tooth by tooth, not one rule for the whole mouth.
What a dentist weighs up for each tooth
When a dentist decides between a filling, an onlay and a crown, they are looking at a handful of practical things rather than following a rule. The first is how thick the remaining walls are. A wall that is thin and undermined by old filling or decay may snap under a cusp; a thick wall can be left alone. The second is cracks. Some fine lines in enamel are harmless and very common, while a crack that runs down into the dentine and hurts on biting usually means the cusps need covering.
The third is the nerve. If a tooth has signs of inflammation or infection, that is treated first, because crowning a tooth with a failing nerve only hides the problem for a while. The fourth is your bite. Heavy grinding or clenching changes how much protection a tooth needs, and sometimes which material is chosen. The fifth is the gum. Crowns last less well in mouths with untreated gum disease, so the gums are usually checked and treated before anything is fitted.
None of these can be judged properly from a selfie. They need an examination and X-rays. That is why a sensible plan from a photo is a starting point, and the final decision on each tooth is made once the dentist can see it.
Questions to ask your dentist
- What would happen if I had a filling or onlay on this tooth instead?
- How much of the tooth is already gone, and can you show me on the X-ray?
- Is the nerve healthy? Is there any infection that needs treating first?
- If we try the smaller option and it fails, can it still be crowned later?
- For a cosmetic plan: which of these teeth are healthy, and why are they included?
At Precious Dental we prefer to protect a healthy tooth rather than crown it, and any decay or infection is treated before crowns. If crowns are the right repair for some teeth and not others, your plan says so, tooth by tooth. For price questions on each option, see crown prices.
If you want a view on whether your teeth really need crowns, send your photos and any recent X-rays through our contact page. We will send a free written plan that says what we would do for each tooth, including the ones we would leave alone.
Common questions
My dentist says I need a crown. Should I get a second opinion?
If the tooth does not hurt, has no large filling and is not cracked, a second opinion is reasonable. Ask what would happen if you chose a filling or onlay instead, and ask to see the X-ray. A good dentist will explain the reasoning.
Can a cracked tooth be saved without a crown?
Sometimes. A small crack line in enamel often needs nothing. A crack that causes pain on biting may need the cusps covered, which can be an onlay or a crown depending on how far it runs. Your dentist decides from examination and X-rays.
Is a crown stronger than my natural tooth?
No. A healthy natural tooth is the best thing you can have. A crown protects a weakened tooth, but the tooth underneath is still natural and can still decay at the edge.
Can I have a crown just to change the colour of a tooth?
It is possible but rarely the first choice for a healthy tooth. Whitening, bonding or a veneer usually change colour with far less drilling. See crowns vs veneers.
Will you tell me if I don't need a crown?
Yes. We prefer to protect a healthy tooth rather than crown it, and your free written plan says what we recommend for each tooth, including when the answer is to leave it alone.
Sources
- Edelhoff D, Sorensen JA (2002). Tooth structure removal associated with various preparation designs for anterior teeth. J Prosthet Dent
- Edelhoff D, Sorensen JA (2002). Tooth structure removal associated with various preparation designs for posterior teeth. Int J Periodontics Restorative Dent
- Saunders WP, Saunders EM (1998). Prevalence of periradicular periodontitis associated with crowned teeth in an adult Scottish subpopulation. Br Dent J
- Morimoto S et al. (2016). Survival Rate of Resin and Ceramic Inlays, Onlays, and Overlays: A Systematic Review and Meta-analysis. J Dent Res
- Demarco FF et al. (2015). Anterior composite restorations: A systematic review on long-term survival and reasons for failure. Dent Mater
- NHS. Dental treatments
- Oral Health Foundation. Crowns
Checked October 2026. Where we give our own view as a clinic, we say so.
Send a selfie smile. Get a written crown plan.
A few photos of your teeth or a recent X-ray is enough to start. A dentist looks at them and you get a written plan: which teeth, which material, why, and the price in pounds. If you don't need crowns, we'll tell you.