However, improper oral hygiene is not the only cause of halitosis formation. This troublesome condition may also occur as a result of using dentures or braces. The hard-to-reach areas around these fillings are difficult to reach with a toothbrush or dental floss, which is why bacteria that cause bad breath thrive there. Other common causes of halitosis include: diabetes, kidney disease and thyroid disease, infections of the sinuses, throat or tonsils, dry mouth, improper eating habits (drinking large amounts of alcohol, smoking, starving oneself), taking certain medications (mainly antidepressants, painkillers and diuretics).
But your tonsils don’t always do their job well. For some people, they’re more trouble than help. Research suggests that people who have their tonsils removed are no more likely to get bacterial or viral infections than people with who keep their tonsils.

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The most common cause of chronic severe bad breath is a dental infection. We do not mean a simple overgrowth of oral bacteria due to a buildup of plaque. That is what we discussed in the previous section. We mean an active dental disease, like decay (cavities) or gum disease.