Teeth is a tale of the promiscuous man’s greatest foe — the vagina dentata — with prudish high school student Dawn (Jess Weixler) as the bearer of the mythological genital adaptation. Debut writer-director Mitchell Lichtenstein skillfully composes the prelude to every dismemberment scene to elicit maximum suspense and then lets the aftermath play out for maximum comedic effect. The majority of the money on this low-budget horror/comedy seems to have been devoted to alarmingly realistic prosthetics that will make even the most valiant of viewers squirm with disgust. Yes, the film is essentially a one-trick vagina, but it’s an unforgettable one — even if it requires virtually every male character to be an amoral horndog. This is fair enough with the high school boys but too dedicated to the cause when even Dawn’s gynecologist is eager to take advantage of her. Still, it’s infinitely more persuasive than any abstinence PSA.