Buckle up, sweet tooths. And look away, dentists. There’s a new larger-than-life temptation in town, complete with 36 oz smoking “goblet” cocktails, “monster” burgers, “insane” milkshakes, and even a $99 ice cream sundae for twelve. It’s all part of the enormous menu at the colorful, now-open Sugar Factory American Brasserie in Pentagon City (1100 Hayes St., Arlington).