Tooth whitening- A dental makeover

Examine tooth discoloration, its causes, and classification, and explore bleaching agents and their mechanisms. Compare nonvital and vital tooth whitening, address tetracycline staining, and review recent scientific advances.

Classify tooth discoloration into intrinsic and extrinsic types, detailing chromogenic materials during tooth development and staining from tea and coffee, with cleaning and whitening as treatment options.

Explore intrinsic tooth discoloration, focusing on posteruptive causes that occur after eruption. The section highlights pulp tissue decomposition and the formation of color-causing compounds when the pulp becomes necrotic.

Learn how pulpal hemorrhage during extirpation can spread pulpal remnants and discolor a tooth from gray to black during root canal treatment. Removing these remnants resolves the discoloration.

Explore root canal medicaments, medicines placed during treatment that can stain teeth gray or black, and learn how endodontists choose materials to reduce discoloration and prevent estrogenic effects.

Explore filling materials in tooth restoration, including amalgam and composite, and understand how amalgam discoloration causes slate gray hues, while composite microleakage can lead to caries.

Depositing secondary dentin on dentinal tubules and teeth occurs with aging, producing an opaque, yellowish appearance and altering light transmission; note the three dentin types—primary, secondary, and tertiary.

Explore the different scaling techniques in dentistry, from traditional scaling instruments to ultrasonic scalers, and understand their roles as a routinely used procedure.

Bleaching, also called tooth whitening, lightens tooth color by applying chemical agents such as hydrogen peroxide, sodium perborate, carbamide peroxide, and over-the-counter options.

Explain mechanism of tooth whitening. Hydrogen peroxide, carbamide peroxide, and sodium perborate penetrate enamel matrix and convert pigmented carbon rings to lighter carbon chains and hydroxyl groups, reducing light absorption.

Classify bleaching procedures into intracoronal non-vital whitening and extracoronal whitening, with intracoronal techniques like walking bleach and thermo catalytic bleach, and extracoronal options including in-office and home-based whitening.

Discover how hydrogen peroxide whitens by penetrating enamel and dentin, releasing oxygen to lighten shade, with home (3–7.5%) and in-office (5–35%) concentrations, plus Opalescence and STI Paul Office gels.

Explore sodium perborate as a water-soluble bleaching agent, ground to powder or liquid form, releasing sodium metaperborate, hydrogen peroxide, and oxygen in walking bleaching for non-vital teeth.

Explore over-the-counter agents for tooth whitening, such as bleaching strips and pens, available from pharmacies or online, and note their limits compared with home, vital, and non-vital bleaching discussed later.

Higher peroxide concentration boosts whitening; lower concentration slows the process. Dentist office whitening uses higher peroxide levels for stronger results, while home whitening uses 10% carbamide peroxide with longer duration.

Explore how temperature influences bleaching efficacy in tooth whitening, detailing heat-activated and light-activated sources, including LED light, and how light intensity and duration affect whitening rate, noting variation by manufacturer.

Explore how contact time between bleaching agents and tooth affects whitening efficacy, noting longer contact improves results up to a limit before causing sensitivity and gingival irritation, varying by manufacturer.

Identify additives that mix with bleaching materials such as hydrogen peroxide, carbamide peroxide, and sodium perborate. Check the manufacturer's table of contents for glycerin or glycol to plan treatment.

Explore thermo catalytic tooth whitening by heating or lighting to activate 30% hydrogen peroxide, and place a hydrogen peroxide–sodium perborate pellet on pulp chamber; walking bleach shows better non-vital results.

Explore adverse effects of tooth whitening, including external root resorption, and learn how intracoronal barriers and gingival barriers prevent resorption and alleviate gingival burning.

Explore home based tooth whitening for vital teeth, using 10% carbamide peroxide as an ADA approved protocol, noting its higher activity, stability, and longer shelf life compared with hydrogen peroxide.

Explore tray fabrication for home whitening using clear polymerized resin aligner-like trays (0.5–1 mm), designed to carry bleaching gel, and discuss studies on their whitening efficiency.

Provide patient instructions for home whitening, including tray placement, applying enough bleaching gel for a four-hour session, and postcare steps; results appear in about 14 days and last 3–6 months.

Explore in-office tooth whitening using 35% hydrogen peroxide, with indications like mild fluorosis and tetracycline stains, and contraindications including hypersensitivity, periodontitis, pregnancy, lactation, and under-18 age.

Combine in-office bleaching with home whitening for the best results when used together. The whitening effect lasts about one year and is shortened by tobacco, coffee, tea, or smoking.

Identify sensitivity as an adverse effect of vital tooth whitening when the bleaching gel enters dentinal tubules, and recommend a sensitive toothpaste for a month.

Prevent gingival irritation during vital tooth whitening by stopping the bleaching, rinsing with copious water, and using a gingival barrier to protect gingival tissues and prevent white patches.