Opalescence 35% CP Mint Teeth Whitening Gel Refill Kit - Professional

In this review the Opalescence 35% CP Mint refill kit is judged as a professional-grade at-home whitening option best suited for users who already have custom trays or aligners. The biggest reason to buy is the strong whitening potency: the 35 percent carbamide peroxide formula is designed for 30-60 minute daily wear and can lift stubborn stains from coffee, wine and smoking in a short span of days. The review focuses on real-world use, ease of syringe delivery into trays, and what to expect if you have sensitive gums.

Key Features

• Professional strength carbamide peroxide: The 35 percent gel offers intensive stain removal and is formulated for visible improvement within 7 days when used 30-60 minutes daily.
• Convenient syringe delivery: Four 1.2 ml syringes make it easy to dispense gel into custom trays, aligners, or retainers without mess.
• Mint flavor and xylitol sweetener: The mint flavor helps freshen breath during treatments while xylitol may reduce the risk of tooth decay.
• No LED required: Part of the Deluxe Opal line, the formula is designed to work without any LED light or additional devices.
• Compatible with common trays: Works with Invisalign-style trays, retainers and custom dental trays, offering flexibility for users who already own appliances.

Who It's For

Opalescence 35% CP is aimed at adults seeking a high-strength, professional-level whitening option to use at home, especially those who already have custom trays, aligners or retainers. It is suitable for people who want faster, noticeable results and prefer a gel refill approach rather than a one-time strip or lamp treatment.

Those with extreme tooth or gum sensitivity, or anyone new to peroxide whitening, should consult a dental professional before use or consider lower concentration products; the formula can cause gum discomfort for some users and is best for people comfortable with stronger peroxide treatments.

Pros & Cons

Pros

• Professional-grade potency that produces visible whitening in a short period.
• Easy-to-use syringes that deliver precise amounts into custom trays.
• Mint flavor with xylitol offers a more pleasant application experience and possible cavity benefits.

Cons

• Higher peroxide concentration may cause gum sensitivity or burning for some users.
• Trays are not included, so additional cost or a dental visit may be needed for proper fit.

Specifications

Product type	Teeth whitening gel refill
Active ingredient	35% carbamide peroxide
Quantity	4 x 1.2 ml syringes (two packs of two)
Flavor	Mint, sweetened with xylitol
Recommended wear time	30-60 minutes per day
Compatibility	Custom trays, aligners and retainers
Made in	USA by Ultradent

Our Verdict

Opalescence 35% CP Mint is a solid choice for users who want fast, professional-level whitening at home and already have or plan to get custom trays. It delivers strong whitening power and convenient syringe delivery at a reasonable refill cost, though sensitive users should proceed with caution or seek professional guidance.

Frequently Asked Questions

How long until I see results?
Many users see noticeable lifting of stains within a week when used 30-60 minutes daily, though individual results vary.

Will it work with my clear aligners?
Yes, the gel is compatible with Invisalign-style aligners, retainers and custom trays for targeted application.

Is it safe for sensitive teeth?
The product is tolerable for some with mild sensitivity, but the 35 percent strength can cause gum discomfort for others; consult a dentist if you have severe sensitivity.