Everything you want to know about freshening up

No. The sharp stinging sensations people associate with whitening come from hydrogen peroxide, and Mr. Fris doesn't contain that. You'll feel the tray in your mouth, but nothing else. If it feels uncomfortable during those 60 to 90 minutes, remove the tray and brush your teeth; you can simply try again the next day.

Sensitivity is rare, but can occur because your teeth temporarily become slightly more porous during whitening. This is completely normal and usually subsides within a day.

The two known side effects of whitening — sensitive teeth and irritated gums — are associated with peroxide. Mr. Fris's formula is peroxide-free, so that reaction won't occur. What you might notice is the temporary sensitivity mentioned above, which will disappear within a day.

The tray sits over your teeth, not on your gums, so the gel barely touches them. If you have an inflammation or an open sore, wait until it has healed. If you're unsure due to a condition or ongoing treatment, consult your own dentist.

You'll often see a difference after just 1 to 2 treatments. You can assess your satisfaction daily and stop as soon as you're happy with your results.

A freshen-up treatment once every 1 to 2 months is enough to maintain your results. How quickly your teeth discolour again depends on what passes by them: coffee, tea, red wine, and smoking are the usual culprits.

After 2 trays, you'll see visible results; the rest of the set is for maintenance. With that rhythm of once every 1 to 2 months, you'll get:

• 5 treatments — approximately half a year
• 10 treatments — approximately one year

Mr. Fris only works on natural tooth enamel. Crowns, veneers, or fillings will not whiten, but it is safe to use.

No worries. You can try Mr. Fris risk-free for 30 days. The only thing we ask: take a before photo and an after photo of your teeth with the date. Don't see results? Then you'll simply get your money back.

Yes, Mr. Fris is gentle and dentist-approved. It contains no harmful chemicals and is safe to use.

No. Whitening agents that can damage enamel do so through high concentrations of hydrogen peroxide. Mr. Fris uses Phthalimidoperoxycaproic Acid: this breaks down discoloration without affecting the enamel itself.

No, the trays do not contain harmful substances. They are gentle, safe, and approved by dentists.

Four ingredients, each with its own task:

• Phthalimidoperoxycaproic Acid — active whitening without peroxide, safe for your enamel
• Glycerin — ensures a comfortable fit during whitening
• PVP — helps the gel adhere well to your teeth for optimal effect
• Xylitol — tooth-friendly ingredient that inhibits bacteria and supports your oral health

Peroxide whitens hard and fast, but it's also the source of common complaints: sensitive teeth and damaged enamel. Dentist Pierre wanted to offer something to his own patients, so he chose a formula that breaks down discoloration without those side effects. It takes a little longer, but it's worth it.

In three steps, the same every day:

1. Place the tray. Start with the bottom. Make sure your teeth are dry and gently press the tray with your tongue. Then place the top.
2. Allow it to work. Wear the trays for 60 to 90 minutes and let the whitening formula do its job.
3. Remove & brush. Remove the trays from your mouth and brush your teeth. Repeat daily.

You'll often see a difference after just 1 or 2 uses.

60 to 90 minutes. Shorter is allowed, but the formula won't fully activate; longer adds nothing.

Use one tray per day. You can stop once you're happy with the results, usually after 1 to 2 uses.

After whitening, we advise you not to eat or drink anything for 4 hours. This gives your teeth a chance to settle and allows the results to fully set in.

Please don't. The formula needs 60 to 90 minutes and is then finished; an entire night won't improve the result, and the tray might shift while you sleep. It's better to choose a time in the evening when you're already at home.

We're a family business, and all your orders are packed with care. You'll receive your package within 1 to 3 business days.

Yes, we ship to Belgium too. Please enter the delivery time and rate here.

Please enter the shipping costs or the free shipping threshold here.

You can try Mr. Fris risk-free for 30 days. Take a clear photo of your teeth before your first treatment and another one afterwards, both with the date. If you don't see results, you'll get your money back.

Please enter the return conditions here: withdrawal period, opened packaging, and who bears the return costs.