Cleaning first
Surface staining may improve with cleaning before cosmetic treatment is considered.
Yellow or stained teeth
Tooth colour concerns may come from surface stain, enamel colour, ageing, diet, old dental work or internal tooth changes.
Last updated 2026-07-29
Why do my teeth look yellow or stained?
Colour concerns can come from surface stain, natural tooth shade, enamel changes, old fillings, wear, diet or a single tooth changing internally. The right option depends on the cause.
What you may be worried about
- Whitening may not work evenly.
- Old fillings or crowns may not change colour.
- A dark single tooth may mean an old injury or nerve change.
Common patterns people notice
- yellow teeth
- stained teeth
- single dark tooth
Possible causes
- Surface stains from food, drink or smoking.
- Natural enamel colour or age-related change.
- Old restorations, cracks or tooth wear.
- Internal changes in one tooth after trauma or previous treatment.
When to treat this as urgent
Urgency level: routine
- One tooth has changed colour after trauma or pain.
- Colour change is linked with swelling, discomfort or a bad taste.
What to do now
- Notice whether colour change affects all teeth, surface stain, old dental work or one tooth only.
- Book a consultation before whitening if you have sensitivity, old crowns or a single dark tooth.
- Seek assessment sooner if colour change follows trauma or is linked with pain or swelling.
What to avoid
- Do not assume whitening will change fillings, crowns or veneers.
- Do not keep whitening if sensitivity is increasing or one tooth is changing colour.
When to arrange a dental assessment
- Arrange assessment if staining is persistent, one tooth has darkened, whitening has not worked or old dental work no longer matches.
What a dentist may need to assess
- Surface stain, natural tooth shade, existing restorations, enamel wear, cracks, gum health and signs of previous trauma or nerve change.
Options that may be considered
Whitening discussion
Whitening may suit some colour concerns, but it does not change fillings, crowns or veneers.
Restorative options
Bonding, replacement fillings or veneers may be discussed only when whitening or cleaning will not address the concern.
What we would consider before recommending treatment
- Whether colour is external stain, natural shade or internal change.
- Existing fillings, crowns or veneers.
- Tooth sensitivity, gum health and expectations.
If it were our own teeth
If it were our own smile, we would want the least invasive option that predictably addresses the actual cause of the colour concern.
A sensible next step
Book a consultation if you want to understand whether cleaning, whitening, restoration or monitoring makes sense.
Possible next steps
- Cleaning, whitening, replacing old restorations, bonding, veneers, monitoring or nerve assessment may be discussed.
Common questions
Will whitening fix all stained teeth?
No. Whitening changes natural tooth shade but does not whiten fillings, crowns or veneers.
Is one dark tooth different from general yellowing?
Yes. A single dark tooth may need assessment for previous trauma, nerve change or old treatment.
Want us to assess your situation?
Book when you feel ready to understand the problem, options and next step.