Teeth whitening gels
Teeth whitening gels

Intensive PAP™ Teeth Whitening Gel Refills

£19.99 £17.99
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Achieve and maintain a sparkling smile with our Intensive PAP™ Kit. Designed to whiten your teeth in the comfort of your own homeour formula delivers noticeable results with no discomfort or sensitivity. 

Experience professional-level whitening in just 10 applications, each taking only 20 minutes.

Key Features   
10 Applications Whiter in 20 minutes
No Sensitivity & No Irritation Safe Formula
Convenient & Easy Vegan friendly

The Intensive PAP formula

Our formula contains the active ingredient Phthalimidoperoxycaproic acid (PAP), which works quickly to remove surface stains and discolouration from the enamel of the teeth.  Potassium nitrate and hydroxyapatite are in the formula too, to remineralise and strengthen your teeth for a healthier smile.

What's included?

  • 4 x Teeth Whitening Gel
  • Teeth Shade Guide
  • User Guide

How to use?

Note: Our gel can be used on its own, but we recommend using it with our LED whitening light. The light will speed up the whitening effect.

Step 1
Attach the LED light to the reusable mouth tray.

Step 2
Apply the gel to the top and bottom of the tray.

Step 3
Insert the tray into your mouth and leave for 20 minutes.

Key ingredients

Phthalimidoperoxycaproicacid (PAP) is scientifically proven to whiten teeth without harmful side effects.

Potassium Nitrate helps alleviate and treat pre-existing tooth sensitivity.

Hydroxyapatite protects the outer layer of teeth, prevents demineralisation and helps rebuild your tooth enamel.

Shipping Information

We aim to dispatch all orders placed before 2 pm GMT Monday-Friday on the same day.

Express UK Delivery

Royal Mail Tracked 24® (1-2 business days) - FREE

Royal Mail Special Delivery Guaranteed by 1pm® - £4.99

International Delivery

Royal Mail International Tracked (5-10 business days) - £7.99

30-Day Money-Back Guarantee

Our teeth whitening product guarantees a minimum of 2 shades whiter teeth. To claim a refund, follow these steps within 30 days of receiving the product:

  1. Take a before and after photo of your teeth along with a photo of the used product.
  2. Email the photos to help@smilerex.com.
We'll process your request in 1-3 business days, so ensure the photos have a valid timestamp.

    Intensive PAP Formula

    Three key ingredients that work in harmony

    Our whitening formula leaves your teeth as strong and healthy as they are beautifully white.


    Teeth Whitening

    Phthalimidoperoxycaproicacid (PAP) is scientifically proven to whiten teeth without harmful side effects.


    Reduce Sensitivity

    Potassium Nitrate helps alleviate and treat pre-existing tooth sensitivity.


    Protect & Rebuild

    Hydroxyapatite protects the outer layer of teeth, prevents demineralisation and helps rebuild your tooth enamel.

    The Science Behind Your Smile

    Would you love a whiter smile? When your teeth are strong and healthy with a pure-white sparkle, you look amazing and feel more confident. Teeth whitening products can help you achieve a dazzling smile – and there’s a unique science behind the way they work.

    Learn more
    Are smilerex® teeth whitening products safe?
    How does the Intensive PAP formula work?
    Can I use smilerex® on caps, crowns, veneers, dental implants, bridges, teeth with braces?
    List of ingredients
    How soon will I see results?

    A Whiter Smile Equals a More Confident You

    Smilerex® is at the forefront of powerful yet safe teeth whitening.

    PAP is scientifically proven to whiten teeth without causing pain or sensitivity.

    Customer Reviews

    Based on 23 reviews
    Sajid Nazir (United Kingdom)
    Good stuff

    This product works amazingly just after ten treatments you will notice a huge difference. I like coffee and it got rid of coffee stains pretty well. Give it a try - Great product, great price!

    Lisa Watch (United Kingdom)
    Excellent product

    Very good product, whitens teeth really well.

    Christine K. (United Kingdom)
    High quality gels

    Good price

    Lauren Lloyd (United Kingdom)
    Great product.

    Fast shipping.

    Martha B. (United Kingdom)
    Gels that actually work

    I can really tell the difference.

    Tom D. (United Kingdom)
    5 out of 5 Works well

    Pleased for sure👍

    Kevin Taylor (United Kingdom)

    teeth look brighter.