How it works

How it works

🧪   A bit of SCIENCE
How does teeth whitening work in general?
Check it out
🤓   A Little bit more science
Why does Sefid use peroxide?
Check it out
✅   Science Backed
How Sefid's strips whiten your teeth in a special way...
Check it out

How teeth whitening works

We use the active ingredient hydrogen peroxide in a safe concentration to penetrate your tooth's enamel and tackle those stubborn stains.

Since teeth are porous, the hydrogen peroxide is absorbed by the enamel and dentine layers of your teeth, allowing those deeper stains to be reached.
01
Peroxide enters tooth's enamel
It then releases something known as free-radical molecules.
02
Stain molecules are broken down
Free-radicals oxidise and break down stain molecules into smaller ones.
03
Tooth appears whiter
Smaller stain molecules, means they're lighter in colour - so the tooth is whiter.
04
Instantly break out into full speed gallop across the house for no reason flop over, yet relentlessly pursues.

Why does Sefid use Peroxide?

Peroxide can penetrate the layers of your teeth, removing molecules that cause stains. Whilst most ingredients only remove surface stains, it is not a good long-term solution to a brighter smile which is why we use peroxide to target those deeper stains for long-lasting results.

Safe but effective results?
We've got you.

GDC approved products, with your safety at heart.

Effective whitening, but gentle on your teeth.

Results worth smiling about.

Is peroxide really that
much better?

Is peroxide
really that
much better?

The short answer is yes! Peroxide has been used by dentists for decades and still safely used to this day.

Peroxide is able to oxidise more effectively than other ingredients and therefore can target deeper stains better, as well as giving longer lasting results.

Learn more about our ingredients →
How does Sefid whiten? 

What's in your Sefid box

AM Strips
Hydrogen peroxide helps for an effective result.
PM Strips
Composed of Carbamide Peroxide and PAP for a gentle night-time routine.
LED Light
Using LED light activation, which speeds up and boosts the whitening power of the strips.
Toothpaste Tabs
Composed of fluoride to prevent cavities. Minty and pink foam to make brushing foam.

AM Strips

Composed of Hydrogen Peroxide, start your day with a bright smile.

PM Strips

Composed of Carbamide Peroxide and PAP for a gentle night-time routine.

Toothpaste Tabs

Composed of Sodium Monoflurophospate to make brushing your teeth fun but clean.

LED Light

Using light activation,  ingredients will get to work quicker upon activation.

Shop Now

Clinically proven oral care

Clinically proven oral care

Clinical trial results

100% achieved whiter teeth1

88% experienced no sensitivity2

0% experienced enamel erosion3

Overall performance

1.5x
longer
results
When used with LED light4
0
safety
concerns5
GDC approved concentration
1 Based on a clinical trial suggesting that peroxide at any concentration can achieve the same optimal whitening shade if enough treatments are done.
2 Based on a clinical trial highlighting that with even 9.5% hydrogen peroxide only 12% of participants reported post-treatment sensitivity.
3 Literature review concluding that when manufacturers instructions are followed, whitening products resulted in no enamel erosion.
4 Results from an in-vitro study suggesting that results from whitening systems using light activation lasted 3 weeks, as opposed to 2 weeks without light.
5 Based on a study concluding that there is no evidence of significant health risks associated with peroxide-based whitening products.

Our science backed formula

Whitening Strips

We use a unique blend of both peroxide and  PAP to achieve the best results.

The hydrogen peroxide in your strips release free radicals which target the organic molecules responsible for staining in your teeth.

This reduces discolouration and makes your teeth appear brighter. Similarly, PAP also targets these organic molecules however, it does not release free radicals.

Toothpaste Tabs

Our kits also use the new activation LED technology to whiten your teeth. The LED light activates the whitening agent in your strips and initiates the chemical reaction.

It speeds up the whitening process and improves the overall result.