Will this remove brown staining? My trays are clean but have turned brown. Been using white vinegar.

Hello J, It really depends upon the type of mouth guard/oral appliance you have and the materials it is made of. We've tested yellow guards and the yellow came off completely, also, some testing removed the yellow completely but on the same guard left some yellow. Others users have reported that the yellow did not clean off, so it is dependent upon what your appliance is made of and how bad the yellow stain might have been there. Sincerely, SmartGuard Rx Inc.

?Is this chlorine free

Yes! The SmartGuard Premium Cleaner is 100% chlorine free.

Is it safe for metal partials

We haven’t had any issues, concerns or corrosion on the metal material on retainer. Not sure if partials are made from a different material, than retainer.

Has anyone used this product in the last 2 months? Is it worth using?

I have used it for the last 2years and I am completely satisfied. One envelope lasts a week to 10 days depending on how well i rinse my dentures before an overnight soak. Actually I will be ordering more next month