Our occasional series, “Secret History,” features profiles of classic D.C. albums as a way of looking back at the District’s contributions to music over time. This installment finds DCist reminiscing over Unrest’s final LP, Perfect Teeth (Teenbeat/4AD, 1993). In a lot of ways, Unrest were the epitome of the best aspects of D.C.’s indie rock culture of the ‘80s and ‘90s. Smart, excitable kids with good ideas and boundless enthusiasm, ambitious without any concrete…