Ingredients

HiSmile's teeth whitening kit and teeth whitening pens use a combination of baking soda and sodium chlorite to whiten teeth. None of the American Dental Association (ADA) approved teeth whitening products use baking soda as a primary ingredient, but the ADA has approved baking soda as an ingredient in several whitening toothpastes, which suggests there is some benefit to using it. And unlike activated charcoal, there doesn't appear to be any concerns surrounding baking soda's abrasiveness.

The teeth whitening kit also includes an LED light tray. It's not custom-fitted for your teeth, but this is not unusual among teeth whitening kits. There's little evidence to suggest the LED light actually speeds up the whitening process, but it shouldn't cause any harm.

Effectiveness

HiSmile is an Australian-based company and its products have not been evaluated by the ADA, but that doesn't mean they're not safe or effective. The reviews on HiSmile's website are largely positive with most users report quick results and no issues with tooth sensitivity -- a common issue among hydrogen and carbamide peroxide-based tooth whiteners.

A few users expressed disappointment with the tooth whitener's performance, so it may not be your best option if you have to whiten your teeth considerably. The manufacturer claims that it can whiten teeth by up to two shades, but if you'd like faster, more noticeable results, you may prefer to invest in a more potent peroxide-based tooth whitener.

Ease of Use

Using the HiSmile teeth whitening kit is a simple three-step process. You attach the mouth tray to the LED light, fill it with the included gel and wear it for 10 minutes at a time. The kit includes six days' worth of gel, and if you'd like more, you can purchase extra tubes through the company's website.

The short wear time is ideal for those with busy schedules and most users report seeing results after the first six-day treatment. Of the few negative reviews of the products on the company's website, there weren't any mentions about tooth sensitivity, which suggests that the manufacturer's claim about this was accurate. If you have sensitive teeth and you find other teeth whitening kits uncomfortable to use, HiSmile may be worth considering.

Price

The initial HiSmile teeth whitening kit is surprisingly affordable compared to many comparable teeth whitening kits, so it's a great choice for those on a budget. The teeth whitening touch-up pen and the gel refills seem comparatively expensive, but they should still be within reach for most people.

HiSmile is unique in they offer a subscription plan for those who wish to receive regular refills. This is only available for the gel refills and some of HiSmile's other oral cosmetic products. The teeth whitening pen cannot be added on. You can choose from one of the company's existing subscription plans or you can build your own, choosing which products you'd like to receive and how often you'd like to receive them. This is a useful option for those who plan to use the teeth whitening kit regularly and don't want to submit a new order every month or two.