[A_C_Slater]

It's probably best that you don't count on inexperienced players folding top pair. Even if you bet all 3 streets. And if you don't bet the turn then you won't feel the need to bluff the river as much. Nothing you say or don't say will influence them more than "I have top pair! I call!!"

They would rather call river with top pair and lose then fold and think that you might have just bluffed them, because being bluffed just one time would mean that they are bad at poker.