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There's not much that needs to be said, really. When comparing the vinyl to the digital using the Coleman to switch between them, the vinyl is just a tubby, somewhat bloated replica of the digital. I'm sure it's the same master. The lost detail on the high end on the vinyl is, I think, detrimental to the sound of the album. Neither copy sounds good since the digital version has a DR of 5 and the vinyl sounds the same, apart from the sonic skew towards the low end. I would never trust the DR readings of vinyl, which can artificially increase the apparent dynamic range without it being true in any meaningful way. The professional way to monitor teeth whitening and how light your teeth are is by using an industry standard guide, rather than by making one up. Typically, both LED kits and kits without LED use the same whitening agents (hydrogen peroxide or carbamide peroxide), so the biggest difference between an LED teeth whitening kit and one without is the use of the LED light. “It is believed that some light sources, including LED, decompose peroxide faster by increasing the temperature to form free radicals that can penetrate the tooth enamel,” says Ang. “This means that, in theory, using a kit with an LED light can whiten teeth faster and more effectively.”

Any dentist can whiten teeth as long as they're registered with the General Dental Council. Registered dental therapists and dental hygienists can also carry out teeth whitening on the prescription of a dentist. But we don’t stop there: We also regularly re-review the categories in which we’ve awarded the PEOPLE Tested seal of approval — because the best product of today might not be the best of tomorrow. And by the way, companies can never buy our recommendation: Their products must earn it, fair and square. Since these are strips, you have to wear them for over an hour, which is much longer than other options on our list. In addition to its comfortable fit, we found that the device was really easy to use and highly accessible, since it’s powered by your smartphone. While we wish we had more formula to continue the treatment beyond a few days, we did see a noticeable change in the color of our teeth after just a couple of uses. Red wine isn't the only culprit when it comes to staining your teeth. A study out of the Johannes Gutenberg University in Mainz, Germany found that the high acid levels in white wine temporarily damage the enamel, making teeth weak and especially vulnerable to stains. Brushing right after drinking Pinot Grigio or anything else that's acidic can worsen the damage since you're essentially grinding the acids in. The good news is, your saliva will remineralize your enamel if you give it a chance. (Crazy, right?) So instead of brushing right away, wait a half hour to give your saliva a chance to work, and chase anything acidic with a glass of water to rinse away the acids. "Drinking water is the best thing you can do," says New York City cosmetic dentist Irwin Smigel. (And since it takes 30 seconds for dark pigments to penetrate your enamel, water is your best weapon against staining, too.) Eating calcium-rich foods such as cheese with your wine helps to neutralize the acids that yellow teeth. 13. Stimulate saliva.Our sole hangup with this product is its more expensive price tag (at full price) compared to some other options on our list, especially considering its a drugstore brand. However, we believe that the whitening kit is well worth the results — plus you can regularly find it on sale.

If whitening pens are more your speed, we found that the Periosciences LED Whitening Kit was highly effective throughout the testing period and gave us our desired results: noticeably whiter teeth. First, we loved how easy it was to apply the gel to the teeth using the pen. We also found that, since the formula (when combined with the light, of course) lightened our teeth by about half a shade every time we used it, we could use it to whiten teeth initially, of course, but also use it as a periodical treatment to target fresh stains caused by coffee and tea. The average shade for a tooth is A3, this is considered a normal colour and around 70% of the population have natural teeth which are within this range. Some beauty salons offer teeth whitening, but this is illegal if there's no dental professional present, and it may put your oral health at risk. Studies have shown that 98% of people are satisfied with results. When discolouration is severe, such as tetracycline staining, this drops to 86%. Hotjar sets this cookie to identify a new user’s first session. It stores a true/false value, indicating whether it was the first time Hotjar saw this user.

We created the PEOPLE Tested seal of approval to help you find the very best products for your life. We use our unique methodology to test products in three labs across the country and with our network of home testers to determine their effectiveness, durability, ease of use, and so much more. Based on the results, we rate and recommend products so you can find the right one for your needs.