Teeth Whitening Gel Refill 4X Syringes 44% Carbamide Peroxide

High-strength. To be used to obtain rapid results, and for those who need whitening more than a few levels. Many other brands on Amazon do not specify what strength their carbamide peroxide whitening gel is. That's a red flag in my opinion. The weaker the gel, the more you must use in order to get the desired results (especially if, as I said, you have deeper staining). I saw noticeable results after 1 use, and even more of a stark, positive difference after the 2nd application. For best results, apply the gel after brushing your teeth, and gently drying your teeth with a tissue, cotton ball, or cotton swabs. Then, apply the gel in a moderately-thick layer on each tooth. Be sure to apply some to any crevices between your teeth. You can also apply it to the biting/chewing surfaces of your teeth near the front (canines and molars) if you desire whitening there. Then, use your mouth guard, or mouth guard and attached LED blue light (I used a mouth guard with LED blue light I had from another kit). That other kit I purchased from Amazon (a different brand/company from this one) was great. The exception is that the carbamide peroxide was weak, and I would end up taking a long time to whiten my teeth (weeks instead of days). Plus, when makers do that (produce a weak gel), they cause consumers to buy more of it to get the whitening level they seek. It's a waste of money. I suggest buying a STRONG gel to begin with of 22% or 35% carbamide peroxide to start, and if you have no sensitivity issues, continue to use that, and use whenever you need a touch-up. I went to 44% after using 22% and 35% over the years (as well as having tried Crest White Strips, professional whitening strips, and over-the-counter (in store) whitening pens). I highly recommend this gel. Only use it if you have no problems with sensitivity, burning, soreness, allergies, and/or adverse reactions with your gums, lips, or inner buccal cavity (inside of the cheeks). I have not had any problems with that so far. My teeth look and feel great after using this! I am a black tea drinker (and occasionally, coffee and red wine). I also use lots of potent spices that can stain teeth (and also fabrics) in my cooking and daily meals (like turmeric, chili powder, cayenne powder, cumin, mace, paprika, Etc). This gel will be my go-to from now on as long as they continue to sell it! The price point is very, very good. There are much weaker strengths of whitening gels in the Amazon market that cost considerably more. The fast and significant whitening that this gel by Zero Glow offers gives a person more bang for their buck. ★ NOTE: Please remember to store your unused peroxide gel in the refrigerator to prevent degradation and weakening due to ambient temperature changes in your home or office. It is not advisable to freeze it from what I have read over the years. ★ Disclaimer: This is a review that is *WITHOUT* any coaxing, promotional incentives, affiliate discounts, business contracts, social media influencer advertising, requests by the company to leave a review, and commissions. I am a regular Amazon Prime customer who shops often due to the deals I find on Amazon as compared to in [brick and mortar] stores. I do not leave reviews on items often, but I felt this product deserved a great review due to others rating it lower than I feel it should be. Zero Glow deserves at least a 4-star rating minimum, and I'm very happy with their product.

Great product and great price. Easy to use and they seem to do the job at whitening your teeth. It comes with a lot of product in each individual syringe. I've tried more expensive brands that provide less product, but these seem to work great.

Gel works well to remove stains and whiten teeth. Don't like the taste, mint flavor would be better.

Very impressed with this stuff! I've used teeth whitening gel before but I ran out and decided to give this stuff a goal not only did they give me an extra syringe! But after two times I already noticed a huge difference!!! Will definitely buy again! The first picture is the before, the second is after two uses. I brush my teeth first, and then use a q-tip to dry them off, I then use the little brush that comes with to paint the gel on and I have a mouth guard with a blue light from a previous kit that I use. This company sells a kit that comes with the mouth guard and light that I would recommend getting it's super cheap! My battery is starting to go dead on my original one so I will probably purchase another one from these guys

Affordable and effective but tastes rather unsavory. If you can get past the chemical goopy texture then it’s a good product.

The strength is not as advertised, diluted. Don’t waste your money on this.

Needs to be used with the UV light (just in case anyone didn't know and was considering purchasing it) Noticably whiter smile every time I use this gel. Each syringe has plenty in it so you can get multiple uses from each (unlike the tubes that came with my BrightOn). Easy to apply onto my UV light. I would definitely recommend this brand if you are looking for refills for your UV light teeth whitener.

Because I'm a coffee and cigar lover, my teeth are prone to staining despite brushing 2-3x daily with whitening toothpaste. I haven't whitened my teeth a year and was shocked at how dingy my smile was, even after my recent routine dental exam and cleaning, so off to Amazon I ran! I know that 44% carbamide peroxide is the highest concentration one can safely use and I was skeptical when I saw this product for under $5 bucks. There were only a few reviews, all positive, so I took a chance and ordered it. I was pleasantly surprised after the first use! I wore my tray for 20 minutes and I swear that my teeth brightened two shades. No stinging, burning, or crazy sensitivity like the other 44% gels I've used in the past. So the next night, I wore my tray for 30 minutes and let me tell you, Wow, wow, WOW! This product ROCKS. I can't wait to see what a week's use will do! I didn't use a UV lamp, but I'm sure the results would be magnified if I did. I totally recommend this, even though it didn't come with instructions. For best results, whitening treatments work best after a professional treatment. I also recommend applying petroleum jelly or any moisturizing lip protectant on your lips to prevent burning and keeping the unused syringes in your refrigerator to keep them fresh.