The beauty product that's become a bathroom staple for half a million people

A bathroom cabinet can tell you a lot about someone's beauty routine. There are the skincare staples, the haircare products and the occasional gadget that promises to make getting ready a little easier.

For more than 500,000 people worldwide, another product has found its way into that routine: SmilePro's Advanced Whitening Kit.

The at-home whitening system has become one of SmilePro's bestselling products, with the company saying a kit sells every 20 seconds globally. It also has more than 5,000 five-star reviews, helping it build a sizeable following among shoppers looking for an alternative to professional whitening.

One reason for its popularity is how little time it takes. Each treatment lasts around 10 minutes, meaning it can be fitted into an evening routine without requiring a trip to the dentist or a lengthy appointment.

The kit combines a dentist-developed whitening formula with a dual LED mouthpiece. Its blue LED light is designed to help lift deeper stains, including those associated with everyday habits such as drinking coffee, tea and red wine, while the red LED light is intended to support comfort and gum health during treatment.

SmilePro says the treatment can result in teeth appearing up to eight shades whiter, although individual results can vary. Each kit contains enough for around 30 uses, bringing the cost to approximately £2 per treatment.

That price point is another reason the kit has caught shoppers' attention. Professional teeth whitening can cost hundreds of pounds, whereas an at-home option can be used whenever it fits into your routine.

The customer feedback has also helped drive interest. Renee B described the product as a "game-changer", saying she had tried several whitening kits but found SmilePro was the only one to show results from her first use.

Another customer, Katherine M, said she noticed "instant results on the first use" and had recommended the product to friends after receiving comments about how white her teeth looked. Kim F also linked the product to confidence, writing that after using it for seven days, she had gone from shade nine to shade three and felt it was worth trying for anyone wanting to boost their confidence.

The product is designed to minimise sensitivity, which could appeal to people who have previously been cautious about whitening. Larissa, one of the reviewers, said she had experienced sensitive teeth in the past but had not encountered problems while using the product.

For anyone considering adding teeth whitening to their beauty routine, the combination of a short treatment time, at-home convenience and relatively low cost makes it easy to understand why SmilePro has attracted such a large customer base.

The SmilePro Advanced Whitening Kit is currently available with 50% off for a limited time. It ships from within the UK with fast delivery and comes with a 30-day satisfaction guarantee.

• Please note that delivery charges may apply.