Teddy Roosevelt was known for so many indelible traits — including his toothy smile.So Aidan Quinn, who plays him in “The American Guest,” made Roosevelt’s choppers a priority when getting into character for the HBO Max series, shot on location in Brazil and in the Amazon jungle.“One of the first things I was insistent on with [director] Bruno [Barreto] — I kept looking at pictures and watching videos and looking at photos of him smiling and laughing — was that we find a dentist to help make me