Dental checkup for A

A had a cleaning and exam today, including X-rays. A had some staining on his teeth. No cavities, but staining. The hygienist said, "I usually see this on grownups who drink coffee, tea, or wine." 

A said, "Oh, I drink a lot of tea." (He drinks jasmine tea with me in the morning, as does L.)

She asked him, "What kind of tea, hot or cold?"

He said, "Oh, I'll drink it pretty much any way. I drink a lot of tea." He means, of course, that sometimes he drinks it straight from the pot and sometimes he lets it cool in the cup before drinking it. I don't know what he'd do faced with actual iced tea.