Foaming Cat

My black cat "Nivea" can often have seriously poor breath. I'm sure it's related to what we feed her but she seems to like it. I thought I'd do something about it Today. I keep one of those little "Sweet Breath" peppermind drops dispensers with me and thought that might improve her breath a bit. She was sitting nicely getting petted and I tipped her head back and landed a single drop on her tongue. She instantly started in with the old peanut butter licking motion. Suddenly her mouth started perfusely foaming like she had eaten an entire bottle of Mr. Bubbles. She was leaving streams of foaming cat juice all over the carpet and trailing it around the house. What a mess. Guess I won't try that again. Didn't seem to have any permanent effects though. Her breath still is aweful.