Why Teeth Turn Yellow, Brown, Gray or White-Spotted

Dr. Shrey Suri · Gurugram · Updated 2026-09-20

Noticing a change in your tooth colour can be worrying, especially when it happens gradually and you cannot pinpoint why. Teeth can turn yellow, brown, gray, or develop white spots for very different reasons, and the right treatment depends entirely on what is causing it. Understanding the cause first helps avoid spending on a treatment that will not actually fix the problem.

Extrinsic causes: stains on the surface

Extrinsic discolouration sits on the outer enamel layer and is usually the easiest to treat. Common causes include:

• Tea, coffee, red wine, and coloured beverages consumed regularly
• Tobacco use, including smoking and chewing tobacco
• Poor brushing habits that allow plaque and tartar to build up and darken over time
• Certain mouth rinses or foods with strong pigments, like turmeric-heavy curries or berries

These stains typically give teeth a yellow-brown or dull appearance and often respond well to professional cleaning and whitening.

Intrinsic causes: changes inside the tooth

Intrinsic discolouration happens within the tooth structure itself, in the dentin layer beneath the enamel. This type is harder to remove with brushing or surface cleaning alone. Common reasons include:

• Aging: enamel naturally thins over the years, letting the yellower dentin underneath show through more
• Medication exposure: tetracycline antibiotics taken during childhood or in the womb can cause gray or brown banding in teeth
• Fluorosis: excess fluoride exposure during childhood tooth development can cause white streaks, spots, or in more marked cases, brown mottling
• Trauma: a knock or injury to a tooth can damage the internal nerve, causing the tooth to darken to gray, brown, or even black over time
• Developmental conditions: some children are born with weaker enamel that appears chalky white or yellow-brown from an early age

How dentists tell the causes apart

At the clinic, we start by looking closely at the pattern, location, and history behind the discolouration. A few things guide the diagnosis:

• Location: stains on the outer surface near the gumline often point to plaque or tobacco, while discolouration affecting the whole tooth suggests an internal cause
• Number of teeth affected: fluorosis and tetracycline staining usually affect many teeth in a similar pattern, while a single dark tooth points to old trauma or nerve damage
• Age of onset: discolouration present since childhood often relates to how the tooth developed, while gradual yellowing over adulthood is more likely diet or age related
• Medical and dental history: knowing about childhood medications, past injuries, or root canal treatments helps narrow down the cause quickly
• X-rays: these help check whether a discoloured tooth has an underlying nerve or root issue that needs treatment beyond cosmetic correction

Matching treatment to the cause

Costs vary depending on which treatment is right for you, but as a general guide, professional cleaning and whitening sit at the lower end, while veneers and internal whitening for a single tooth are on the higher end. In Gurugram, the typical range for whitening treatments is roughly Rs 6,000 to Rs 20,000, while veneers usually fall in the typical range of Rs 8,000 to Rs 25,000 per tooth depending on material. These are general estimates and your dentist will confirm actual costs after an examination.

When to get it checked

Not every colour change needs urgent attention, but it is worth booking a visit if you notice a single tooth darkening on its own, white spots appearing suddenly, or discolouration accompanied by sensitivity or pain. Early evaluation often means simpler, more conservative treatment options.

Treatment costs mentioned on this page are indicative ranges for the Gurugram region. Your exact cost depends on your case and will be confirmed after a clinical examination at the clinic.