Teeth Whitening

Teeth Whitening at DentalX Downsview Dental Clinic

The colour of your smile naturally changes over time due to everyday factors such as coffee, tea, red wine, and smoking. Even brushing too aggressively or the natural ageing process can gradually reduce the brightness of your teeth by wearing down the outer enamel layer. As enamel thins, the darker underlying dentine becomes more visible, making teeth appear dull or discoloured.

At DentalX Downsview Dental Clinic, we offer safe, reliable, and professional teeth whitening treatments designed to enhance your smile while maintaining a natural appearance. Our goal is to deliver noticeable results while ensuring your teeth remain healthy and well cared for.

Our whitening systems are clinically tested and carefully selected for their effectiveness and safety. Many patients experience a significant improvement in brightness, with results that can reach a very light, natural-looking shade depending on individual suitability.

With proper at-home maintenance and guidance from our dental team, whitening results can be long-lasting. We also provide custom trays and instructions to help you maintain your brighter smile over time.

Our experienced team is here to support you throughout your whitening journey, ensuring comfortable treatment and predictable results. Contact Us today.

FAQs

What's the difference between in-office whitening and at-home whitening ?

The main difference between in-office whitening and at-home whitening is the strength of the whitening agent, speed of results, and level of professional supervision.

In-Office Teeth Whitening

In-office whitening is done at the dental clinic under professional supervision.

How it works:

A high-strength whitening gel is carefully applied to your teeth
The gums are protected to avoid irritation
In some cases, a special light may be used to enhance the effect
The entire treatment is completed in a single visit

Benefits:

Fast results (often noticeable in one appointment)
Performed and monitored by a dental professional
Ideal for patients wanting immediate improvement

Considerations:

Can cause temporary sensitivity in some patients
Typically more expensive than at-home options

At-Home Teeth Whitening

At-home whitening is done using custom-made trays provided by your dentist.

How it works:

Impressions or digital scans are taken to create custom trays
A lower-strength whitening gel is placed in the trays
You wear them at home for a set period each day or overnight

Benefits:

Gradual, controlled whitening
Can be more comfortable for sensitive teeth
Easy to maintain and repeat as needed

Considerations:

Results take longer (usually 1–2 weeks or more)
Requires consistent daily use for best results

Key Difference

In-office whitening = faster, stronger, immediate results
At-home whitening = slower, gentler, more gradual control

Which one is best?

The best option depends on:

How quickly you want results
Your level of tooth sensitivity
The amount of staining present
Your lifestyle and preference

A dental assessment helps determine which treatment is safest and most effective for your smile.

Will it damage my teeth?

No — professional teeth whitening does not damage your teeth when it is carried out correctly under dental supervision.

Whitening treatments work by using safe, controlled bleaching agents that temporarily open the pores in the enamel to remove stains. Once the treatment is complete, the enamel naturally rehydrates and returns to its normal state.

What you might notice (normal effects)

Temporary tooth sensitivity (especially to cold)
Mild gum irritation if gel briefly touches the gums
These effects are short-term and usually resolve within a few days

What does NOT happen with professional whitening

It does not “thin” or permanently weaken enamel
It does not remove healthy tooth structure
It does not cause long-term damage when used properly

Why supervision matters

When whitening is done by a dental professional:

The strength of the gel is carefully controlled
Gums are protected
Your teeth are assessed beforehand to ensure it’s safe for you
Any existing issues (like cavities or gum disease) are treated first

Important note

Over-the-counter or unregulated whitening products are more likely to cause problems because they may be too strong or poorly fitted.

If you’re unsure whether whitening is right for you, a quick dental assessment can confirm the safest option for your smile

If my teeth get sensitive, will it be permanent?

No — tooth sensitivity after professional whitening is almost always temporary, not permanent.

Why sensitivity happens

Whitening agents temporarily open microscopic pores in the enamel so stains can be lifted. During this short period, your teeth may react more to cold, air, or sweet foods.

How long does it last?

Most people: 24–72 hours
Some cases: up to a few days
Permanent sensitivity from professional whitening is extremely rare

How we reduce sensitivity

Adjusting the strength or frequency of whitening gel
Using desensitising agents before, during, or after treatment
Recommending sensitive toothpaste before and after whitening
Custom-fitted trays (for home whitening) to prevent gel leakage

When to tell us

If sensitivity lasts longer than expected or feels uncomfortable, let us know. We can pause treatment, modify it, or provide additional relief options.

Professional whitening is designed to be safe, controlled, and comfortable

Will my fillings change colour?

No — fillings do not change colour with tooth whitening.

Why fillings don’t whiten

Professional whitening gels only work on natural tooth enamel. Materials used for fillings (such as composite/white fillings), crowns, or veneers do not respond to whitening agents.

What this means for your smile

Your natural teeth will become whiter
Existing fillings will stay the same shade
If a filling is on a visible tooth, it may look darker after whitening

What we usually recommend

Whitening before replacing visible fillings
Shade-matching new fillings to your freshly whitened teeth
Reviewing older fillings after whitening to see if replacement is needed for aesthetics

This approach ensures the most natural, even-looking result. If you’d like, we can assess your fillings and plan whitening accordingly.