Whitening is the most searched cosmetic dental treatment and the one with the most misinformation attached. Here is a straight assessment of the options.
First, why your teeth are the colour they are
There are two entirely different causes, and they respond to completely different treatments.
Extrinsic staining sits on the surface. Tea, coffee, paan, tobacco, red sauces. This comes off with scaling and polishing.
Intrinsic discolouration is within the tooth structure. Genetics, ageing, tetracycline exposure in childhood, fluorosis, trauma to a single tooth. Bleaching gel addresses some of this. Some of it does not respond to bleaching at all.
Working out which one you have is the entire first step, and it takes about two minutes in a chair.
The options, ranked honestly
Scaling and polishing. Often the only thing needed. A meaningful number of patients who book whitening have scaling done as preparation and then decide the whitening is unnecessary. Cheapest option, and it also happens to be good for your gums.
In-clinic clinical whitening. Concentrated gel, gums fully isolated, four to eight shades in a single session. This is the strongest option and the fastest. The concentration is only usable because the soft tissue is professionally sealed off first.
Supervised take-home kits. Custom-made trays and lower-concentration gel used over two to three weeks. Gentler, cheaper, and genuinely effective. Good for patients with existing sensitivity.
Supermarket strips and generic trays. Weak concentrations and a tray that does not fit your arch, so the gel sits unevenly. You may get one or two shades. Mostly harmless, mostly disappointing.
Salon and beauty parlour whitening. Avoid this. The strong gel needs proper gum isolation to be safe, and chemical gum burns are what happens when it is applied without that.
Charcoal toothpaste. No. Activated charcoal is abrasive. It scrubs off surface stain and, with prolonged use, enamel along with it. Thinner enamel means more of the yellow dentine underneath shows through, so long-term use makes teeth look darker. It is actively counterproductive.
Baking soda, lemon juice, salt. Mildly abrasive at best, acidic and enamel-eroding at worst. Lemon juice on teeth is a genuinely bad idea.
What whitening cannot do
Crowns, veneers and fillings do not change colour. This is the single most important thing to understand before starting.
If you have a white filling on a front tooth and you whiten, the tooth lightens and the filling stays exactly where it was. Now it is visible.
So the order matters: whiten first, wait about two weeks for the shade to stabilise, then match any new restorations to the new colour. Doing it the other way round means paying twice.
It cannot fix tetracycline banding, severe fluorosis, chips or shape. Those need veneers.
It does not work with braces on. Whitening around brackets leaves patches when they come off. Whiten after debonding.
Sensitivity, realistically
Some sensitivity for a day or two after treatment is common and it resolves. It happens because the gel temporarily opens the microscopic tubules in dentine.
It is manageable. A desensitising treatment is included with every in-clinic session here, and if you already have sensitive teeth we adjust the protocol rather than pushing through it. Tell us beforehand.
How long it lasts
Twelve to twenty-four months for most patients.
The variables are entirely dietary. Tea, coffee, paan, cola and smoking shorten it considerably. For the first 48 hours after treatment the teeth are particularly porous, so avoiding staining foods in that window makes a real difference to how long the result holds.
Who should not whiten
- Pregnant or breastfeeding patients
- Under-eighteens, generally
- Anyone with untreated decay or active gum disease, which must be dealt with first
- Patients whose front teeth are largely restored, where veneers are the better answer
The sensible sequence
- Scaling and polishing
- Look at the result and decide whether you still want whitening
- If yes, in-clinic or supervised take-home
- Wait two weeks for the shade to settle
- Then, and only then, replace any visible fillings or plan veneers
Skipping straight to step three is how people end up with patchy results and mismatched fillings.