Types of Teeth Whitening Treatments Explained

With so many teeth whitening options available — from pharmacy shelves to the dental chair — it can be overwhelming to figure out which treatment is actually worth your time and money. The truth is, not all whitening methods are created equal. They differ in how they work, how effective they are, and how long results last.

At Orion Dental in Scarborough and Milton, we offer professional teeth whitening using the Philips Zoom system, as well as custom take-home whitening trays. This guide breaks down every major whitening treatment type so you can make an informed decision.

Two Ways Whitening Works

All teeth whitening treatments rely on one of two fundamental mechanisms:

1. Chemical bleaching — The majority of whitening products use hydrogen peroxide or carbamide peroxide as their active ingredient. These peroxide compounds penetrate the porous enamel surface and undergo an oxidation reaction that breaks apart the pigment molecules (chromogens) responsible for tooth discolouration. The higher the concentration and the longer the contact time, the more dramatic the whitening effect.

2. Mechanical abrasion — Some products, particularly whitening toothpastes, use fine abrasive particles to physically scrub stains from the enamel surface. This is similar to the polishing your hygienist performs during a dental cleaning. Abrasion removes surface (extrinsic) stains effectively but cannot change the intrinsic colour of your teeth.

1. Whitening Rinses

Whitening mouthwashes contain a very low concentration of hydrogen peroxide (typically 1.5 to 2 percent). You swish the rinse for about 60 seconds before spitting. Because the contact time is so brief, whitening rinses produce the least noticeable results of any whitening method. They can help freshen your breath and may provide a very subtle brightening over months of consistent use, but they should not be expected to deliver a visible transformation.

2. Whitening Toothpastes

Whitening toothpastes combine mild abrasives with low concentrations of bleaching agents. Used twice daily over several weeks, they can remove light surface stains and maintain brightness after a professional whitening treatment. However, they lack the concentration and contact time needed to produce significant colour change on their own. Look for products with the Canadian Dental Association (CDA) seal to ensure safety and efficacy standards are met.

3. Whitening Gel Strips

Whitening strips are thin, flexible plastic strips coated with a peroxide gel (typically 3 to 10 percent hydrogen peroxide). You apply them to the front surfaces of your teeth for 30 minutes to an hour daily, over a period of two to four weeks. Strips deliver noticeable results and are one of the more effective OTC options.

The main limitation is uneven application. Strips don't perfectly conform to the curves and contours of each tooth, which can result in inconsistent whitening — particularly in the spaces between teeth and along the gum line.

4. Custom Take-Home Whitening Kits

Dentist-provided take-home kits represent a significant step up from OTC products. Your dentist takes impressions of your teeth and fabricates custom-fitted trays that conform precisely to your tooth surfaces. You fill the trays with a professional-grade carbamide peroxide gel (typically 10 to 22 percent) and wear them for a prescribed period — usually 30 minutes to a few hours daily, or overnight, for one to two weeks.

The custom fit ensures even gel distribution across every tooth, minimises gel contact with the gums, and delivers more consistent, predictable results than any OTC tray kit. These trays are also reusable — you can purchase additional gel syringes for touch-ups, making them an excellent long-term investment.

5. In-Office Professional Whitening

In-office whitening is performed in the dental office using higher-concentration gels than over-the-counter products. At Orion Dental, we use the Philips Zoom WhiteSpeed system, which is completed in approximately one hour. Here's how the process works:

In-office whitening offers several advantages: immediate results, professional supervision, custom gum protection, and the ability to treat deeper intrinsic stains that OTC products cannot reach. It may suit patients who want a visible change in a short time, though whether it is appropriate for you depends on a clinical assessment.

All Whitening Methods Compared

This table summarises the key differences between each whitening approach:

How to Choose the Right Whitening Treatment

The best whitening treatment depends on several factors unique to your situation:

For mild surface stains and maintenance, whitening toothpaste or strips may be sufficient. For noticeable, lasting results, professional take-home trays or in-office Zoom whitening are the most reliable options. Many patients opt for a combination approach — an in-office treatment for immediate impact, followed by custom take-home trays for periodic touch-ups.

Get Started With Professional Whitening

Understanding your options is the first step toward a brighter smile. At Orion Dental, we'll evaluate your teeth, discuss your goals, and recommend the option that suits your situation — whether that's an in-office Zoom session, custom take-home trays, or a combination of both.

Book a whitening consultation at our Scarborough or Milton office. Book an appointment or call 416-291-0306 (Scarborough) / 905-636-9770 (Milton).