Yes, teeth whitening pens can work, but how well depends on how the gel is used. A pen paints a thin layer of whitening gel onto your teeth. On its own, that layer is exposed to saliva and is not held against the teeth, so a pen used alone suits quick touch-ups more than a big change in colour. Used with an LED light and a mouth tray, as in the SmilePro Advanced Kit, the same kind of pen is part of a full treatment: up to 8 shades whiter in 7 days, in 10 minutes a day.
This guide explains how whitening pens work, what to expect, and how a pen compares with strips and an LED kit.
How do teeth whitening pens work?
A whitening pen holds gel in a barrel with a brush tip. You twist or click the pen until gel reaches the tip, then paint it onto the front of your teeth. The whitening ingredient in the gel works on stains from coffee, tea, red wine and smoking while it stays in contact with your teeth.
That contact is the difference between products. Strips hold the gel against your teeth with a flexible film. An LED kit holds it in place with a mouth tray while the light speeds the gel up. A pen used on its own has nothing holding the gel in place.
Do whitening pens work on their own?
They can help with light surface staining and are handy to carry, but expect a smaller change than from strips or an LED kit. Because the gel layer is thin and open to saliva, a standalone pen is best for keeping a result you already have, between full courses.
Choose carefully. The Oral Health Foundation explains that in the UK and Europe it is illegal to supply whitening products containing more than 0.1% hydrogen peroxide directly to the public, so whitening pens sold online should use a different whitening ingredient, such as PAP.
How are SmilePro whitening pens different?
SmilePro pens are not designed to be used on their own. They are the gel pens in the SmilePro Advanced Teeth Whitening Kit: you paint the gel on with the pen, put the LED mouthpiece in and switch the light on. The blue LED speeds up the gel and the red LED is designed for a more comfortable treatment. The light switches itself off after 10 minutes. Always use the gel with the light, never on its own.
When the pens in your kit run out, the SmilePro Teeth Whitening Pen Pack refills it: 3 pens with 10 treatments in each, 30 in all. At one top-up every 2 weeks, a pack lasts over a year.
Pens vs strips vs LED kit at a glance
| Whitening pen on its own | SmilePro Teeth Whitening Strips | SmilePro Advanced Kit (pen and LED light) | |
|---|---|---|---|
| How the gel stays on | Painted on, nothing holds it | Held by the strip | Held by the LED mouth tray |
| Time per treatment | Varies by brand | 30 minutes | 10 minutes |
| Result | Usually a small change, best for touch-ups | Up to 5 shades whiter | Up to 8 shades whiter in 7 days |
| Best for | Carrying with you | Travel and top-ups | Your first course and regular top-ups |
Current prices are on each product page, in your local currency.
What is in the gel?
SmilePro's UK and European pens use a peroxide-free PAP (phthalimidoperoxycaproic acid) formula with potassium nitrate and hydroxyapatite. The full ingredient list is on the Pen Pack page. It is enamel safe and formulated to help prevent sensitivity in healthy teeth when used as directed.
How do I use a whitening pen with an LED light?
- Brush your teeth with water.
- Click the pen until gel appears, then paint a thin layer onto the front of your top and bottom teeth.
- Put the LED mouthpiece in and switch on the light. It turns itself off after 10 minutes.
- Rinse with water, then wait 1 hour before eating or drinking anything except water.
How often should I use a whitening pen?
With the SmilePro kit, use it once a day for 7 days for your first course. After that, a top-up every 2 weeks helps stop new stains setting in, or once a week if you drink a lot of coffee, tea or red wine. Never use whitening products for more than 14 days in a row without a dentist's supervision.
Are whitening pens safe?
Used as directed by people with healthy teeth and gums, whitening products from reputable brands are generally well tolerated. Temporary sensitivity, often to cold, is the most common side effect. Avoid getting gel on your gums, do not swallow it, and stop and see a dentist if your gums or mouth become sore, red or swollen.
Who should not use a whitening pen?
SmilePro whitening products are not for anyone under 18, or anyone pregnant or breastfeeding. See a dentist first if you have sensitive teeth, unhealthy gums, gum disease, an oral infection, recent dental surgery or amalgam fillings. Whitening does not change the colour of crowns, veneers or fillings.
The bottom line
A whitening pen on its own is a handy touch-up tool. For a real change in colour, use the gel with something that holds it in place: strips, or an LED kit. The SmilePro Advanced Teeth Whitening Kit pairs the pen with an LED light for up to 8 shades whiter in 7 days, with a 30-day money-back guarantee (conditions apply), and the Pen Pack keeps your result topped up.
Read next: Whitening strips vs LED kit, Does LED teeth whitening really work? and Teeth whitening for sensitive teeth.
Sources
This guide is general information, not dental advice. If you have any concerns about your teeth or gums, speak to a dentist.
- SmilePro product information: Teeth Whitening Pen Pack, Advanced Teeth Whitening Kit, Teeth Whitening Strips, and our Terms and Conditions (who should not use SmilePro products).
- Oral Health Foundation, Tooth whitening and the law.
- NHS, Teeth whitening, page reviewed 19 August 2025.
Last updated: 16 October 2026.
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