How to prepare for professional teeth whitening

Professional whitening is straightforward, but the preparation matters. A check before treatment helps identify the cause of discolouration, protects sensitive areas and makes the expected result much clearer.

Start with a dental check

Decay, cracked teeth, leaking fillings, exposed roots and inflamed gums can all make whitening uncomfortable. They also need attention for reasons that have nothing to do with colour. Your dentist may take photographs, compare shades and decide whether any treatment should happen first.

Discolouration can occasionally be a sign of trauma, decay or a problem inside one tooth. Whitening every tooth is not the right response when one tooth has changed colour for a specific reason.

Clean away plaque and surface stain

If tartar or heavy surface stain is present, a scale and clean may be recommended before whitening. This gives the gel more consistent contact with the tooth surface and provides a more accurate starting shade. Do not scrub aggressively at home in an attempt to prepare; that can irritate the gums and make sensitivity worse.

Discuss sensitivity in advance

Temporary sensitivity is a common whitening side effect. Tell your dentist if cold drinks already hurt, if your gums have receded, or if whitening has caused pain before. They may suggest a sensitive toothpaste before the appointment, a lower concentration, shorter sessions or a take-home approach that gives you more control.

Know what will and will not whiten

Whitening gel changes natural tooth structure. It does not change the colour of crowns, veneers, bridges or tooth-coloured fillings. If these are visible when you smile, your dentist can explain whether whitening may create a mismatch and whether any restoration would need to be replaced after the shade has settled.

In the days before treatment

• Keep brushing gently twice a day and clean between the teeth.
• Avoid experimenting with abrasive powders or strong online products.
• Use sensitive toothpaste if your dentist recommends it.
• Tell the clinic about pregnancy, breastfeeding, allergies, medical conditions and medicines.
• Ask what to eat and drink after treatment so you can plan ahead.

On the day

Brush normally, eat beforehand unless the clinic advises otherwise, and arrive with a list of questions. The team will record the starting shade, protect the soft tissues and explain what you may feel. Whitening should not be treated as a promise of a particular shade; natural enamel, existing restorations and the type of stain all affect the outcome.

After the appointment

Sensitivity generally settles, but follow the instructions you are given and contact the clinic if pain is strong or persists. For the first day or two, limiting strongly coloured food and drinks can help while the colour stabilises.

Read more about professional whitening options or arrange a dental check-up first.