1 / 7Opalescence 20% Carbamide Peroxide Whitening Gel Syringes
Opalescence 20% Carbamide Peroxide Whitening Gel Syringes are a refill gel for use with compatible dental trays. The listing specifies 2–4 hours of daily wear and includes four 1.2 ml syringes, trays are not included.
At a glance
- Refill gel is supplied in syringes for delivery into compatible trays.
- Listing says no LED light is needed or recommended.
- The manufacturer claims whitening of up to 10 shades in 7 days, results are not independently verified.
Reference price: $34.00
Price checked: Nov 11, 2026
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Pros and cons
Pros
- Four syringes provide refill gel for repeated tray applications.
- The stated 2–4-hour wear window offers a defined daily-use range.
- Listing describes compatibility with Invisalign trays, aligners, retainers, and custom dental trays.
Technical specifications
5 specifications| Brand | Ultradent |
|---|
| Active ingredient concentration | 20% Carbamide Peroxide |
|---|---|
| Daily wear time | 2-4 Hours a day |
| Syringe volume | 1.2 ml |
| Dimensions listed | 4 x 4 x 6 inches; 1.2 ounces |
|---|
What to know before buying
- The listing calls this a professional-level product for home use, follow the supplied directions and use only with a compatible tray. Trays are not included.
- Customer feedback reports mixed sensitivity and gum-irritation experiences, and some customers mention expired or dried-up product, check the expiration date and seal on arrival.
Who is it for?
A good fit for
- People seeking tray-applied whitening gel who already have a compatible tray.
- Buyers comfortable with the listed 2–4-hour daily wear period.
Less suited to
- People who need a whitening kit with trays included.
- People seeking an LED-based whitening system, the listing says LED light is not needed or recommended.
Customer reviews on Amazon
- 5 stars
77% 77% - 4 stars
12% 12% - 3 stars
5% 5% - 2 stars
2% 2% - 1 star
4% 4%
Customer feedback describes noticeable whitening, including reports after two nights, and ease of use. Experiences with sensitivity and gum irritation vary, and the stated 2–4-hour wear time is a concern for some. Some customers also report expired or dried-up product. These comments are relevant to buyers weighing wear time and comfort, but do not establish a guaranteed result or the condition of any particular package. The aggregate rating is 4.5 out of 5 from 5,411 ratings, that overall figure does not explain individual outcomes.
Positive themes
- Customers report whitening effectiveness and ease of use.
Negative themes
- Some customer feedback reports expired or dried-up product.
Mixed feedback
- Customers report varied sensitivity and gum-irritation experiences.
- Opinions about the 2–4-hour application period are mixed.
Frequently asked questions
Are trays included?
No. The listing identifies compatible trays but says they are not included.
How long is the gel worn each day?
The listing specifies 2–4 hours a day.
Is an LED light required?
The listing says no LED light is needed or recommended.
How many syringes are listed?
The listing describes four 1.2 ml syringes.
