Do the ingredients in this "Fresh Dental Water Additive" look ok? safe?

I got this as a gift bought at Target.

Fresh Dental Water Additive
 

Fresh Dental Water Additive features natural ingredients that help clean teeth and freshen breath with no brushing required! Without proper dental care, 80% of dogs and 70% of cats show signs of periodontal (gum) disease by age three. Left untreated, oral disease can lead to tooth loss, pain and serious health conditions affecting the heart, kidney and lungs. Fresh Dental Water Additive helps keep your pet's teeth clean and breath fresh for up to 12 hours!

Available in 18oz. (533ml) size

Directions: Simply add one tablespoonful (one cap full) to your pet’s water bowl (approx 16 oz) every time you refill it.

Ingredients: Purified Water, Glycerin, Cetylpyridinium Chloride, Citric Acid, Potassium Sorbate, Green Tea Leaf Extract.

http://www.naturelpromise.com/products/fresh-breath-water-additive.php

Note

The Potassium Sorbate and Purified Water are safe.

But the rest of the ingredients aren't very good for your cat. 

 Without proper dental care, 80% of dogs and 70% of cats show signs of periodontal (gum) disease by age three.

Click to expand...

The above quote is lies, all lies. My cat is 11 years old, I never gave her any dental stuff. No gum disease yet.

No cat I know gets dental treatment, none of them have gum disease.

So this stuff isn't going to kill your cat, but the only thing it's going to help is it's teeth. 

Green Tea Leaf Extract was given to dogs and rats, caused kidney problems.

I don't know about the ingredients being safe but my preferance for my cat's dental hygiene has been one I have control over in terms of dose.  I have used dental wipes and enzyme paste for that reason.

I had 2 cats previously that never had dental problems but my current cat started to get very sick with gum infections when he was only a few months old.  He drinks a lot of water and I wouldn't want him taking in too much of a product, if he didn't drink enough I'd worry the oposite way.