Hi good to see your query. Excess tea us harmful as u know but max two cups liker or green tea any one can drink. there are some tea are in a certain quantity good as antioxidants as per studies all over world. Anything excessive very wrong causes gastric disorders. Take also after B.F & evening .not odd time. There are lot of body metabolism where skins may affected this is one reson of smoking, alcohol excess caffeine etc.so go for good tea timely

drinking excess tea causes acidity and increase caffeine content in body