Not every stain responds to whitening. The useful distinction is whether the discolouration is on the surface of the tooth or inside it — because that decides the treatment.
Surface stains
These sit on the enamel and come from what passes over the teeth: tea, coffee, tobacco, red wine and strongly coloured foods. Tartar build-up also makes teeth look yellow or brown near the gum line.
Surface stains usually respond well to professional cleaning and whitening.
Internal discolouration
This comes from within the tooth and does not lift with ordinary whitening:
- Injury to a tooth, which can darken it over months or years.
- A tooth that has had root canal treatment, which may grey slightly.
- Certain medicines taken during tooth development, which cause banding.
- Excess fluoride during childhood, causing white or brown mottling.
- Age. Enamel thins over time, letting the naturally darker layer beneath show through.
These need a different approach: internal whitening for a single dark tooth, or veneers and bonding where the colour cannot be lifted.
Matching the treatment to the stain
- Cleaning removes tartar and surface staining, and is the sensible first step for most people.
- Professional whitening lifts stains within the enamel. Results vary with the starting shade.
- Bonding covers localised marks.
- Veneers are used where discolouration is deep or uneven across several teeth.
- Crowns and existing fillings do not whiten — they may need replacing to match a new shade.
Keeping teeth brighter
Reduce tea, coffee and tobacco; rinse with water after staining drinks; keep up daily cleaning between the teeth; and have professional cleaning at the interval advised.
Common questions
Why is only one of my teeth dark? That usually points to an internal cause, such as an old injury, and needs assessment rather than standard whitening.
Do whitening toothpastes work? They help with surface staining but do not change the underlying shade of the teeth.
Will whitening damage my enamel? Professionally supervised whitening is designed not to; repeated unsupervised use is where harm comes from.
Read more about teeth whitening in Rajkot and smile designing, or book a consultation.