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Teeth Whitening Gel Refills

Refill option

How Afterpay works

Fill Your Cart

Fill your cart
Add your favourite Smileflex products to your cart and head to checkout.

Choose AfterPay At Checkout

Choose Afterpay at Checkout
Select Afterpay as your payment method in the third step of checkout.

Enjoy Instant Approval

Enjoy Instant Approval
Log into or create an Afterpay account, with instant approval in seconds.

Split Into Installments

Split into Instalments
Your purchase will be split into 4 instalments, to be paid every 2 weeks.

You don’t have to wait until payday for dental care!

Unlike a traditional lay-buy, Afterpay allows you to receive your products straight away, meaning you can smile now and pay later!

All you need is:

  • To have a debit or credit card ready
  • Be over 18 years of age
  • Be a resident of Australia

To use this service:

  • Select Afterpay as your payment option in checkout
  • Follow the prompts to either create or log in to your Afterpay account

Shipping information

FREE

Australia Post Standardon all orders $70+ (including 3-way shipping for custom orders!)

$6.99

Australia Post Standardon orders below $70 (4-6 business days)

$9.99

Australia Post Expresson all orders (1-2 business days)

Please note: The shipping time frames above may differ in length between each state.

Estimated delivery time frames are based on Metro areas.

Need gel refills for your Smileflex custom trays? Maintain or improve your smile with our dental grade whitening formula. Each refill box contains 3 gel syringes for a total of at least 9 treatments. Flex your smile and save by selecting our 6 syringe option which includes free shipping!

Yes, custom-fitted whitening trays are required for the use of our dental grade formula. If you don't already have custom trays, check out our full range of custom whitening kits.

Products such as aligners (Invisalign), retainers, mouthguards, night guards and LED mouth trays will not work in place of custom trays. Learn more.

  • Dental grade gel formula
  • 6% Hydrogen Peroxide
  • Results last up to 13x longer than LED whitening kits
  • Custom-fitted whitening trays required
A whiter smile for longer


Dental Grade Gel Formula

A whiter smile for longer. The Smileflex formula is powered with Hydrogen Peroxide, the most effective whitening agent offered by cosmetic dentists. Needing no LED light activation, our teeth whitening gel is specially formulated for your custom-fitted trays. The Smileflex formula is safe and PAP+ free—an abrasive ingredient used in generic formulas—ensuring no enamel damage or tooth dehydration takes place.
Up to 13x longer lasting than PAP and PAP+ formulas used in LED whitening kits1
  3x more efficient than Carbamide Peroxide formula2
1Based on expected results lasting 9-12 months for Hydrogen Peroxide formula compared with expected results lasting 3-4 weeks for PAP and PAP+ formulas.
2Based on the recommended 30-60 minutes application time for Hydrogen Peroxide formula compared with the recommended 1-3 hours application time for Carbamide Peroxide formula.

Advanced Shade Guide™

The all-in-one system for all. Our advanced shade system covers all teeth staining chroma. Afterall, teeth stain in shades of four major colour categories⁠: red-brown, red-yellow, grey and red-grey. With your included Smileflex Advanced Shade Guide™, you'll be able to colour match more accurately and progressively track your whitening results with ease.

Product details

The teeth whitening gel refill comes complete with 3 teeth whitening gel syringes (6 x syringes option available), a Smileflex Advanced Shade Guide™, and an instruction booklet.

Tap an ingredient for more information

Teeth Whitening Gel

Glycerin, Water, Hydrogen Peroxide (6%), Propylene Glycol, Xanthan Gum, Sodium Citrate, Menthol, Sodium Phytate, Carob Gum, Salicylic Acid, Sodium Silicate, Xylitol, Tetrasodium Pyrophosphate.
Sodium Bicarbonate Free Abrasive Free SLS Free

Teeth Whitening Gel

Glycerin, Water, Hydrogen Peroxide (6%), Propylene Glycol, Xanthan Gum, Sodium Citrate, Menthol, Sodium Phytate, Carob Gum, Salicylic Acid, Sodium Silicate, Xylitol, Tetrasodium Pyrophosphate.
Sodium Bicarbonate Free Abrasive Free SLS Free

Shipping information

FREE

Australia Post Standardon all orders $70+ (including 3-way shipping for custom orders!)

$6.99

Australia Post Standardon orders below $70 (4-6 business days)

$9.99

Australia Post Expresson all orders (1-2 business days)

Please note: The shipping time frames above may differ in length between each state.

Estimated delivery time frames are based on Metro areas.

Returns information

If your order is incorrect, faulty, or missing, please contact us and our friendly customer support will respond within just a few hours.

If your custom items do not fit in a way they can be used as intended, you can submit a returns form within 7 days of delivery for one of our dental technicians to review.

If you are not satisfied with the non-custom items you have received, you can submit a returns form within 30 days of receipt, providing they are in original resalable condition.

To learn more about our returns policy, and to submit a returns form, visit our Returns Policy page.

How Afterpay works

Fill Your Cart

Fill your cart
Add your favourite Smileflex products to your cart and head to checkout.

Choose AfterPay At Checkout

Choose Afterpay at Checkout
Select Afterpay as your payment method in the third step of checkout.

Enjoy Instant Approval

Enjoy Instant Approval
Log into or create an Afterpay account, with instant approval in seconds.

Split Into Installments

Split into Instalments
Your purchase will be split into 4 instalments, to be paid every 2 weeks.

You don’t have to wait until payday for a whiter smile!

Unlike a traditional lay-buy, Afterpay allows you to receive your products straight away, meaning you can smile now and pay later!

All you need is:

  • To have a debit or credit card ready
  • Be over 18 years of age
  • Be a resident of Australia

To use this service:

  • Select Afterpay as your payment option in checkout
  • Follow the prompts to either create or log in to your Afterpay account

Frequently Asked Questions

You asked, we answered! We’ve put together some of the most commonly asked questions about our teeth whitening gel refills. If you can't find the answers you're looking for below, head over to the Smileflex Help Centre for even more information.

When you visit a dentist for a custom teeth whitening kit, the teeth impressions taken are sent to a dental laboratory like us anyway! Our Smileflex dental technicians create your custom whitening trays the same as they would for a dentist. We also use the same active ingredients in our whitening gel that dentists use.

Yes but keep in mind, artificial dental work will not whiten. They are colour matched at the time they are created and do not have pores. The colour of your dental work cannot be changed (unless it is replaced).

All teeth whitening work by absorbing into pores on the tooth surface. The active whitening agent in our dental grade formula is Hydrogen Peroxide (H2O2), a naturally occurring compound which breaks down readily into water (H2O) and a single oxygen molecule (O). This single oxygen molecule is a strong oxidising and disinfecting agent, and is what gives Hydrogen Peroxide such effective whitening properties.

Teeth whitening is only achieved with either Hydrogen Peroxide (HP) or Carbamide Peroxide (CP) and requires custom-fitted trays to use. HP and CP produce the same results, however HP whitens 3x faster and requires 3x less strength to that of CP to achieve the same results. This is because of the time needed for the CP to break down into HP first.

While formulas found in LED whitening kits such as PAP and PAP+, are merely a temporary teeth "lightening" effect by dehydrating teeth rather than whitening and removing tooth stains. In the dental industry we call this "rebound" and people using those products find once their dehydrated teeth return to health 3–4 weeks later, their original tooth stains reappear (as they were never removed).

With all factors considered, it's why Smileflex chooses Hydrogen Peroxide as its active whitening agent to achieve the best and longest lasting professional results.

Yes! Our product has proven to be highly effective at removing stains from teeth including coffee, tea, wine, tobacco, tetracycline, and various other tooth stains.

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Teeth Whitening Gel Refills
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