The black tea polyphenols owns. These substances with antioxidant action to protect the body in front of the harmful action of free radicals, which weaken the system of defenses and accelerate the aging process. It is also known that consumption of antioxidants helps to reduce the risk of diseases such as cardiovascular disease, the degenerative and even certain types of cancer.
Astringent

The tannins are components of tea that gives it its characteristic bitter taste. They have an astringent effect, so their consumption is beneficial in cases of diarrhea and other digestive disorders such as gastritis, among others.
Diurético

The significant diuretic effect of tea helps eliminate excess liquid waste substances along with the body.
Reconfortable and low in calories
If sugar is added little or no sugar it produces a drink that, with few calories, it provides a nice sense of satiety (hot quenches more than what cold), which is a healthier alternative face of sugary soft drinks.

Stimulant

Like coffee, tea drinking is a good stimulant that helps clear the mind and awaken the body.

It also has the following properties:

It has anticancer properties and antioxidants.
It is healing, and prevents ageing bactericidal
It reduces the risk of cardiovascular disease.
Low levels of blood cholesterol and protects against cavities.
It helps combat fatigue.
Stimulates defenses and mental functioning.
The cardiovascular system is one of the greatest beneficiaries of the effect of antioxidant flavonoids such as:

Improving the ability of expansion and contraction of blood vessels (as they help maintain the fabric or endothelium covering the inside of blood vessels) which, according to many studies may reduce the risk of heart attacks. This is also beneficial for those with a tendency to dilate blood vessels.
It facilitates the oxidation not "good" cholesterol and prevents the formation of atherosclerotic plaques that are responsible for many cardiovascular accidents.
Their contribution of fluoride helps in the prevention of dental caries.  Externally there are people who use it in cases of conjunctivitis or eye strain (applies doing a bathroom or way of eye drops). It can also reduce the bags under the eyes applying it in the form of cold