How often can you use it?

DFW Dental Supplies only sent me 2 syringes. Mike said he would not send my other 2 until I took down a negative review! Not fair!!!!

whats the difference between 20% and 35 %?

I think the lower strength has to stay on for a longer period of time. When I first started wiih this I kept the trays on for hours and the 35% only stays on for 1/2 hour

I have a diy mouthguard that i made from a mold. could i use that for the mouth trays or should i buy new trays?

You maybe able to use it as long as there is room for the gel in the tray.

how long do you leave it on?

I been leave it over night, and according to my dentist that was the cause of my gum damages.35% it’s too much, I should not use more than 15% or even better to be 10%

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Opalescence35% CP Mint - Gel Syringes Teeth Whitening - Refill Kit (4 Syringes Total) Carbamide Peroxide Gel. Made by Ultradent. Tooth Whitening Refill Syringes 5197-2

Opalescence35% CP Mint - Gel Syringes Teeth Whitening - Refill Kit (4 Syringes Total) Carbamide Peroxide Gel. Made by Ultradent. Tooth Whitening Refill Syringes 5197-2

Product ID: 1813623

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Details

Brand
Opalescence
Active Ingredients
Carbamide
Product Benefits
Whitening
Item Form
Gel
Number of Items
4

⏳Whiten up to 10 shades in 7 days

🌿Mint flavor with xylitol sweetener

💎35% Carbamide Peroxide Power

Description

✨ Brighten your smile, boost your confidence! 💼

RAPID RESULTS IN JUST ONE WEEK - Lift stubborn stains from coffee, wine, and smoking—see up to 10 shades whiter in 7 days.
PROFESSIONAL GRADE WHITENING AT HOME - Trusted by 25,000+ dental pros for a dazzling smile without the office visit.
AWARD WINNING FORMULA BACKED BY 30 YEARS - Join 100 million bright smiles powered by Ultradent’s 50+ teeth whitening awards.
EFFORTLESS APPLICATION WITH SYRINGE PRECISION - Easy-to-use gel syringes fit perfectly with Invisalign, retainers, and custom trays—no LED light needed.
FRESH MINT FLAVOR WITH DECAY REDUCING XYLITOL - Enjoy a refreshing whitening experience that’s gluten-free, kosher, and tooth-friendly.

Opalescence 35% CP Mint Gel Syringes offer professional-level teeth whitening with a potent carbamide peroxide formula that whitens teeth up to 10 shades in just 7 days. This refill kit includes four 1.2 ml syringes of mint-flavored gel, compatible with Invisalign and custom trays, requiring no LED light. Trusted by over 25,000 dental professionals and backed by 30+ years of expertise, it’s a convenient, award-winning solution to lift stains from coffee, wine, and smoking while being gluten-free and sweetened with xylitol to support oral health.