Teeth whitening is one of the most common aesthetic treatments in modern dentistry. The treatment is based on oxidizing agents, usually hydrogen peroxide or carbamide peroxide, which penetrate the tooth structure and break down pigments that cause discoloration.
Today, two main whitening methods are common: In-office whitening and at-home whitening, each with unique advantages, disadvantages, and clinical considerations. Additionally, there are non-conventional home methods using common household substances, but not all are safe or effective.
Who Is Teeth Whitening For?
Teeth whitening is intended for patients with external stains caused by coffee, tea, red wine, and smoking, as well as mild to moderate internal stains from age or old trauma. The treatment is suitable for vital teeth without significant structural damage and for patients seeking an aesthetic improvement of the smile without invasive treatment. Teeth with a yellowish hue generally respond better to whitening, while gray teeth or those with deep internal stains respond less, and results may be limited.
Not every patient is suitable for teeth whitening. In cases of active decay, cracked teeth, severe wear, active gum disease, or uncontrolled high tooth sensitivity, the underlying problem must first be treated. Teeth with extensive anterior restorations (crowns, veneers, or large fillings) do not respond to whitening, so managing expectations is important. For safety reasons, whitening is generally not performed on pregnant or breastfeeding women.
Types of Whitening
In-office whitening is performed at the clinic, usually using high concentrations of hydrogen peroxide (about 25%-40%). The treatment is relatively short, allows full control by the dentist, and provides rapid, sometimes immediate, results. This method is especially suitable for patients seeking a quick aesthetic change or before an important event.
Conventional at-home whitening uses custom trays and lower-concentration whitening agents (about 10%-20%) over several days to weeks. This method allows gradual lightening, better control of the final shade, and longer-lasting results.
In many cases, in-office and at-home whitening can be combined. In-office whitening serves as an initial treatment for a quick change, while at-home whitening completes the result, stabilizes the shade, and reduces early color relapse. This combination is considered an effective and balanced protocol in terms of results, safety, and patient comfort.
When whitening is performed following professional diagnosis, planning, and supervision, it is safe. Studies show that controlled use of whitening agents does not cause permanent damage to enamel or dental pulp. However, uncontrolled use, high concentrations without supervision, or overly frequent treatments may increase the risk of side effects.
Side Effects of Whitening
The most common side effect is temporary tooth sensitivity, experienced as pain or discomfort when exposed to heat or cold, which usually subsides within days. It can be reduced by adjusting exposure times, taking breaks between treatments, and using desensitizing agents.
The most serious complication, though rare, is damage to the dental pulp, potentially leading to irreversible pulpitis, especially in teeth with hidden cracks, a history of trauma, or uncontrolled use of whitening agents. Additionally, uncontrolled contact with gums may cause temporary chemical burns.
What About “Home” Whitening Methods?
There are whitening methods performed without a dentist, sometimes called “grandma methods,” including whitening strips, whitening toothpastes, and household substances like lemon or baking soda.
Whitening strips generally contain low concentrations of whitening agents and can provide slight, temporary lightening, mainly on front teeth. However, they are not customized and may cause sensitivity or gum irritation, since unlike controlled whitening with custom trays, strips have no effective barrier between the whitening agent and soft tissue.
Whitening toothpastes do not change the internal color of teeth and mainly remove external stains through abrasive or chemical action. They are suitable for people who regularly consume coffee, tea, or other pigmented substances, and are mostly effective for surface stains. Since their effect is abrasive, prolonged daily use is not recommended, as it may wear enamel, expose dentin, and increase tooth sensitivity.
Using lemon or baking soda is not considered a safe or effective whitening method, as acidity and abrasiveness can damage enamel, increase sensitivity, and cause irreversible harm over time, without significant aesthetic benefit.
Is Teeth Whitening Permanent?
Whitening results are not permanent, and gradual return to the original color is expected. Duration varies among patients and depends on lifestyle habits, oral hygiene, and touch-up treatments. Results can usually be maintained long-term by avoiding pigmented foods for the first 48 hours, practicing strict oral hygiene, and undergoing periodic touch-ups every 6-18 months.
In summary, teeth whitening is an effective, conservative, and safe aesthetic treatment when performed individually and under dental supervision. Proper diagnosis, expectation management, and a thoughtful combination of whitening methods are key to a stable aesthetic result and maintaining tooth and gum health.
Dr. Nour Mahajne is a specialist in oral rehabilitation at MakabiDent.