Too much garlic can cause bad breath, mouth ulcers, gastritis, as well as stomach ulcers and irritable bowel syndrome. Although garlic has anti-inflammatory and antiseptic effects, it is not better to consume too much of it, but it can have an impact on your health. Garlic contains allicin, a substance that has a certain odor, and too much garlic can produce bad breath in the mouth. Garlic is very irritating and can damage the oral mucosa when chewed in the mouth, so some people can develop mouth ulcers after eating too much of it. Garlic can also corrode the gastric mucosa when it enters the stomach, so if you eat too much garlic regularly, the possibility of suffering from gastritis and gastric ulcers will increase. Garlic is a pungent and stimulating food, and when it enters the intestinal system, it can induce irritable bowel syndrome due to the stimulation of the intestinal system, resulting in bloating, abdominal pain, diarrhea and other manifestations.