First, mint
The faint scent of mint can not only help refresh human mind and keep up the spirit, but also can reduce the "bad breath". Mint contains certain chemical substance, which can reach the lung through the blood circulation, so as to make your breath pure and fresh. In the European and American countries, many families use mint leaves to make mouthwash, which can alleviate the discomfort caused by inflammation and swelling of gingiva. Foreign study has also found out that, using mint as mouthwash can also reduce the growth of oral bacteria. After you have eaten a lot of fish and meat, you can drink a cup of sugar-free mint tea, which can eliminate the excessive fat and relieve the abdominal distention.

Second, guava
If you want to make your gingiva always stay healthy, it is a good idea to eat guava. Guava is low in calorie, so a lot of people use it to increase the sense of satiety when they are on a diet. What's more, guava contains the most abundant vitamin C in all the fruits, while vitamin C is an important nutrient to maintain the health of gingiva. If human body seriously lacks of vitamin C, the gingiva will become weak, and people will be prone to diseases, thus leading to gingival swelling, bleeding gums, loose teeth, and other symptoms.

Third, cheese
Who know that lack of calcium would undermine the bone. In fact, it may also damage the health of teeth. As a result, we should take in enough calcium from all kinds of natural food. Cheese is a good source of calcium. It can play an important role in the protection of teeth. British study points out, the calcium and phosphate contained in cheese can balance the Ph value in the oral cavity, so as to avoid the oral cavity stay in an acidic environment, which is beneficial for the activity of bacteria and may cause tooth decay. Moreover, often eating cheese can increase the calcium on the surface of teeth, so as to make the teeth much stronger.

Fourth, sugar-free gum
Chewing sugar-free gum can increase the secretion of saliva and neutralize the acidity in the oral cavity, so as to further prevent tooth decay. The study from Minnesota University has found out that, sugar-free gum with xylitol has an obvious effect of inhibiting the bacteria which may cause dental caries. Xylitol is a kind of sugar substitute with little heat. It can produce a sweet taste, but it will not be utilized by the oral bacteria.