Natural compounds can fight bad breath and prevent cancer

Dietary flavonoids with an average daily consumption of 25–50 mgs.[12]

Flavonoids like Quercetin can prevent inflammation and cancer.  Quercetin can temporarily control or reduce malodor. and may reduce plaque, caries, gingivitis, periodontal disease, oral mucosal ulceration or oral cancer. The etiology of malodor involves many factors such as gingivitis, periodontitis, nasal inflammation, chronic sinusitis and diabetes. Plaque is the major etiology of dental caries, gingivitis and periodontal diseases. Antibacterial activities of quercetin is the most likely explanation on how it prevents these diseases. Quercetin can also help accelerate the healing process of minor aphthous ulcers and inhibit human oral cancer cells from growing.

Some foods containing Quercetin:

red kidney beans, radish leaves, carob fiber, dill, cilantro, fennell, red onion,   watercress, kale, buckwheat, chokeberry, canberry, lingonberry, plus, cow peas, sweet potato, blueberry, raw (powdered), bilberry , rowanberry, prickley pear cactus.

See what Dr. Axe says about Quercetin benefit for the entire body:

https://draxe.com/quercetin/