A written treatment plan, reading glasses and pen on a desk

Quick answer

In Sydney, professional in-chair whitening commonly costs $500 to $900, custom take-home whitening kits $300 to $600, and supermarket products under $100. Dentist-supervised options use stronger, regulated concentrations with custom-fitted trays, which is why results are faster and more even. Whitening only works on natural enamel (not crowns, veneers or fillings) and not all discolouration responds, so a dental check first prevents spending money on the wrong solution.

The three routes

  • In-chair whitening: roughly $500 to $900. Strongest concentration, applied with gum protection, most of the change in a single visit.
  • Custom take-home kits: roughly $300 to $600. Custom-moulded trays with professional-strength gel, whitening gradually over one to two weeks. The best-value professional option for most people.
  • Supermarket strips and pastes: under $100. Legally limited to much weaker concentrations. Modest results on mild surface staining, little effect on deeper discolouration.

Why the check-up comes first

Whitening gel doesn't diagnose. Greyish discolouration from an old injury, tetracycline banding, and white spots respond differently (or not at all), and whitening over undetected decay or gum disease genuinely hurts. Ten minutes of examination first tells you whether whitening will work on your teeth, which is cheaper than discovering it won't.

Crowns, veneers and fillings don't whiten. If you're planning cosmetic work, whiten first, then match the new work to the lighter shade. Sequencing this wrong is an expensive, common mistake.

The sensitivity question

Temporary sensitivity is the main side effect and it's manageable: desensitising toothpaste beforehand, correct-strength gel, and pacing the treatment. This is where supervision earns its keep; the internet's advice is to push through, ours is to adjust the plan.

Keeping the result

Whitening isn't permanent: coffee, tea and red wine reapply themselves daily. Results typically hold one to three years, longer with a custom tray top-up once or twice a year. This is another quiet argument for the take-home route: you keep the trays.