Philips Zoom, a well-known brand in professional teeth whitening, offers a one-hour in-clinic treatment for £850, promising a noticeably brighter smile. The process includes a quick dental cleaning, a 3D scan of the teeth to create custom trays for at-home use, and the application of a whitening gel activated by a blue LED light. The treatment may involve up to four 15-minute sessions, with fresh gel applied each time. Afterward, a desensitizing gel is used, and the patient is shown how to use the take-home trays and syringes for future touch-ups. The individual who tested this treatment started with teeth at shade A1 and achieved shade B1, the lightest natural shade on the color chart. The main difference between professional and at-home whitening lies in the strength of the whitening agent. In the UK, consumer products are limited to 0.1 per cent hydrogen peroxide, while Philips Zoom uses a six per cent concentration under dental supervision. Dr Elvis Law, a dentist at Dr Wyman Chan, explains that professional whitening is designed to penetrate through the enamel and reach the dentine underneath, where the natural tooth color can be altered. The individual found the treatment not painful but more cumbersome than at-home options. They experienced some sensitivity, with a dull ache across their teeth, but it was not severe. The results were noticeable, especially on their lower teeth, which had previously been harder to target with at-home methods. The individual also tested an at-home kit, the Smilepro advanced teeth whitening kit, which costs £55. This kit uses PAP (phthalimidoperoxycaproic acid) instead of hydrogen peroxide and offers three LED settings. The treatment involved applying the formula directly to the teeth, inserting a mouth tray, and leaving it to work for 10 to 30 minutes. The individual found the tray comfortable and experienced no sensitivity during testing. The Philips Zoom treatment was able to push the individual's teeth from shade A1 to B1, which they hadn't achieved with strips, gels, or LED mouthguards. However, the combination of Smilepro strips and an LED mouthguard provided a visible overall lift and remained the most effective at-home kit tested. The individual found that the results on their upper teeth with Smilepro were comparable to what they achieved with Philips Zoom. However, the lower teeth saw a more significant improvement with the professional treatment. The individual is conflicted about the £850 price for Philips Zoom, noting that at-home kits for less than £10 have produced visible results. However, if teeth have plateaued with home whitening, repeatedly spending on DIY kits may not be the most efficient use of money. The individual found that Philips Zoom delivered results they hadn't achieved at home but would recommend the more affordable SmilePro kit to those concerned about sensitivity. Based on the changes seen in their upper teeth, the individual couldn't justify spending £850 on Zoom, but the results on their lower teeth slightly changed their mind. They suggest starting with a good at-home kit if teeth are already relatively white and a lift of a shade or two is desired.