Have you ever heard of "tea breath"? I haven't.... probably because tea drinking does not cause bad breath. Coffee's association with halitosis is a disadvantage relative to tea's breath-neutral properties.

The cause of "coffee breath"

Volatile sulfur compounds accumulate in the mouth after drinking coffee, which causes a strong, pungent smell, often compared to garlic or rotten eggs.

Tea has very small amounts of volatile sulfur compounds. Tea has the added benefit of polyphenols with antimicrobial and deodorizing properties.