To play with a pair of aces is necessary on constant raises. Because if you do not raise, you will either win a small bank or you lose a big one. After all, someone can collect on the flop two weak pairs, and you can not throw off the aces. It is necessary to understand what kind of hands this opponent is playing. If you raised before the flop, the opponent carefully leveled the bet, and after the flop he himself increased greatly - this could mean that the opponent has a set. Depending on the nature of the opponent's game, you can understand with which cards he will take your enhancements. It's not so difficult to drop a pair of aces after the flop. Before the flop, you can bet all your money if the opponent plays aggressively, but be prepared to fold after the flop.