Yeah, it's always nice when people stereotype southerners. That's the link to the second ranked dental school in the country which is consistently regarded as one of the very best in the world, and it's housed in the second oldest public university in the nation. If yankees brought dentists with them, they were just bringing the quality of dental care here down, not up.
If brewing sweet tea is so easy, how come yankee kids in restaurants (and I've worked with plenty of them) so consistently can't get it right?
You should thank them for bringing dentists to the area. Dumping simple syrup in to the tea vat takes a few years of culinary school. Have patience. People from outside the South aren't as hip to the subtle complexities of mayonnaise and sugar.