philip lyle hansen , 56 , has pleaded not guilty to 11 charges .
on wednesday wellington district court heard of his teeth ` fascination '
he allegedly removed six teeth from one woman , 47 , during sex .
hansen later allegedly removed her wisdom teeth with a screwdriver .
he is said to have injured four women between 1988 and 2011 .
defence lawyer mike antunovic suggested hansen was trying to help .