Why aren't there over-the-counter mouthwashes to cure halitosis?

Patents. Are still on the ones you need a script for. It's all about money!
Profitable? Like every other product on the market...It is there because of the profit potential. There are many things to control bad breath and advice to be given but for now the few products that can help "cure" or eliminate halitosis are available at many dental offices. For yu...Try to discover the cause of your halitosis. It may have a simple cure like...Go lightly on the onions and garlic.
Halitosis & mouthwas. Halitosis cannot be cured by mouthwash. Halitosis can be caused by decay, periodontal disease, poor oral hygiene and build-up of plaque, dry mouth, smoking, and other mouth infections. Halitosis can also be caused by dietary choices, and syatemic diseases. Mouthwash can only temporarily mask odors.