Opalescence 20% with PF Whitening Whitening Refill Kit (4 Packs / 8 Syringes) Carbamide Peroxide. Made by Ultradent, in Melon Flavor. Tooth Whitening Refill Syringes - B-5401-4

Squirt in your retainer. Wear it all night. Our dentist recommended this and it works perfect. Extremely white teeth

Keeps your teeth whitened without looking neon

This is the stuff my dentist sold me when I got my teeth trays made. 35 percent works to gently clear away stains and yellowing. Its not a quick process, but if used consistently over 14 days you'll see whiter teeth.

I ordered an 8pk of Opalescence from seller; product arrived timely and I am happy with product.For those using 15%- you may want to try the 20%- works just about the same- the 5% didn't seem to make much of a difference; however, I would like to comment on teeth sensitivity.If you have sensitive teeth, you may want to continue using what your dentist recommends.

I have ordered these before, but originally got them from the dentist. These are much cheaper and do the same for me.

Opalescence is a super effective brand. Will whiten your teeth several shades with little to no sensitivity. It is however very irritating to the gums. I find that this flavor burns my gums significantly less than the mint versions. Def recommend.

It does work somewhat as far as whitening but as soon as I put it on with my Invisalign there was a foaming crackling sound and it was super uncomfortable and I wanted to take off the retainer straight away but I barreled through. Taking it off 25 min later I see my gums are white, swollen, and irritated. Probably won't get this strength again !

The process works with patience.