Hello. Thank you for asking your question. My name isXXXXX will try to help.
Sodium benzoate is a salt of benzoic acid, which has the same toxicity rating as sodium chloride (table salt)--moderately toxic. At the concentrations that the benzoates are used in foods
or other supplements (usually less than 0.5%), they are not likely to adversely affect health. At high concentrations, these products can cause oral corrosive injury and vomiting, and high concentrations injected into rats caused tremors, seizures and death.
As long as it is under 1%, it should not be a problem.
The brethalyzer is only labeled for dogs on the product website.
Also it does not list the percentage of sodium benzoate on the ingredient label.
So I would not use it in cats.
You could try the CET aquadent as that is labeled for cats.
To be honest, I have tried a number of the water additives and I never noticed any benefit.
I have the best luck with tartar control diets. They bake the kibble, then spray the flavoring on the outside, so it is extra crunchy on the inside. With regular kibble, the flavoring is baked through.
Try to avoid canned food as much as possible.
Canned food sticks to the teeth and causes plaque build up.
Tooth brushing is always best but my own cats will not put up with that so I do not expect you to be able to do it. But if you can, great.
One thing I do is put a dab of the meat flavored tooth paste on the paw.
Then they have to lick it off.
I hope this helps.
If you have additional quesitons, please reply.