Noticing a dark spot, patch, or discolouration on your tooth can be worrying. Is it simply a surface stain or the start of a cavity? While both can look similar, the difference between a tooth stain and a cavity is more important than many people realise.
A tooth stain is usually a surface discolouration from food, drink, or smoking, while a cavity is decay that damages the tooth structure. Cavities may look like dark spots but often cause sensitivity or pain. Only a dentist can confirm the difference and provide the right treatment.
At Sherwood Park Dental Practice in Sutton, our team regularly sees patients concerned about discoloured teeth. In some cases, it’s a cosmetic issue easily solved with professional cleaning or whitening. In others, it’s a sign of early tooth decay requiring treatment before it worsens.
Here’s how to tell the difference – and why seeing a dentist is the safest way to protect your smile.
What Causes Tooth Stains?
Tooth stains are very common and usually harmless. They happen when substances discolour the enamel (the outer layer of the tooth). Stains can be:
- Extrinsic stains (surface-level): Caused by coffee, tea, red wine, dark sauces, or smoking. These sit on the enamel and can often be polished away.
- Intrinsic stains (below the surface): Staining inside the tooth, often linked to ageing, certain medications (like tetracycline), or excessive fluoride during childhood.
- General discolouration: Over time, enamel naturally thins, exposing the yellower dentine underneath.
Although stains can be frustrating, they are usually cosmetic and don’t damage the tooth itself.
What Is a Cavity?
A cavity, or dental caries, is a small hole in the tooth caused by decay. Unlike a stain, it’s an oral health problem that needs treatment. Cavities form when:
- Plaque and bacteria produce acids that erode the enamel.
- The enamel weakens and breaks down, leading to visible pits or dark spots.
- If left unnoticed, the decay can spread deeper, which can cause pain, infection, or even tooth loss.
Early signs of a cavity include:
- Brown, black, or grey spots on teeth.
- Sensitivity to hot, cold, or sweet foods.
- Rough or pitted texture on the tooth surface.
- Bad breath or a persistent bad taste.
Tooth Stain vs Cavity: Key Differences
While they may look similar, stains and cavities are very different in cause and treatment.
- Appearance: Stains are flat patches of colour, while cavities often create pits, holes, or rough edges.
- Sensation: Stains are painless, but cavities may cause sensitivity or toothache.
- Progression: Stains remain stable until removed, while cavities get worse without treatment.
- Treatment: Stains can be polished or whitened, while cavities require fillings, inlays, or more advanced restorative care.
It can be nearly impossible to tell the difference with the naked eye. That’s why only a dentist can accurately diagnose whether your discolouration is cosmetic or something more serious.
Why You Shouldn’t Ignore Tooth Discolouration
Trying to guess whether it’s a stain or cavity isn’t worth the risk. Here’s why you shouldn’t delay:
- Whitening can mask decay: Using whitening products on an undiagnosed cavity doesn’t remove the problem – it just hides it. See our professional whitening page for dentist-approved teeth whitening options.
- Cavities spread: Decay left untreated will grow, leading to more invasive (and expensive) treatment later.
- Infections are possible: Advanced decay can affect the nerve of the tooth, requiring root canal treatment.
- Oral health links: Cavities and gum disease can impact overall health if not treated promptly.
In short: don’t ignore tooth discolouration. A quick dental check-up could save your tooth.
How Dentists Diagnose Tooth Stain vs Cavity
At Sherwood Park Dental, your dentist will:
- Examine your teeth visually and with specialised tools to detect soft spots or pits.
- Take digital x-rays if needed to confirm whether the discolouration is surface-level or deeper decay.
- Clean the teeth professionally to see if stains lift away – revealing any underlying cavities.
- Provide a personalised treatment plan based on your diagnosis.
This process is quick, painless, and gives you peace of mind.
Treatment Options
- For stains:
- Scale and polish (professional cleaning).
- Lifestyle advice (reducing stain-causing foods/drinks, quitting smoking).
- Professional teeth whitening for a brighter smile.
- Scale and polish (professional cleaning).
- For cavities:
- Fillings (to restore strength and stop decay).
- Inlays/onlays or crowns if damage is extensive.
- Root canal treatment if decay reaches the tooth’s nerve.
- Fillings (to restore strength and stop decay).
Our priority is always to catch cavities early so treatment is minimally invasive and cost-effective.
Why Choose Sherwood Park Dental Practice?
When it comes to tooth discolouration, accurate diagnosis is key. At Sherwood Park Dental in Sutton, patients trust us because:
- Led by Dr Pablo Lobato, with over 20 years’ experience in restorative and endodontic dentistry.
- Comprehensive services under one roof – from hygiene care and whitening to fillings and implants.
- A friendly, patient-focused team who explain everything clearly.
- Advanced technology for accurate, comfortable diagnosis and treatment.
- Flexible 0% finance options, helping you manage costs with ease.
We’re here to help you enjoy a healthy, confident smile without the guesswork.
Book an appointment today
Noticed a brown, black, or grey spot on your tooth? Don’t wait to find out whether it’s a stain or a cavity.
Book a check-up at Sherwood Park Dental Practice in Sutton today and let our team give you the clarity – and care – you need.
Book Your Appointment Now or call us on 020 8642 7000
FAQs
1. How can I tell if my tooth discolouration is a stain or a cavity?
Stains are usually flat and painless, while cavities can cause sensitivity and roughness. However, only a dentist can confirm for sure.
2. Can whitening remove a cavity?
No. Whitening products only affect stains. Cavities require professional treatment such as a filling.
3. What does a cavity look like in the early stages?
It may appear as a small brown or black spot, often mistaken for a stain, but it will gradually worsen if left untreated.
4. Are brown spots on teeth always cavities?
Not always. Some are stains, but others can be early decay. That’s why a dental check-up is essential.
5. How do dentists treat stained teeth compared to cavities?
Stains can often be removed with cleaning or whitening, while cavities need restorative treatments like fillings or crowns.