A hair trimming guide offers four edges; a first curved edge, a second curved edge, a first straight edge, and a second straight edge. An output control circuit of an energization pattern controller supplies a combined energization of pulse depolarized type energization and at least one of direct current type energization and pulse energization between an anode-side device and a cathode-side device of iontophoresis. The repeatable optical waveguide interconnection may further include a first index matching elastomeric solid layer having a proximal face chemically bound to the first end face and a low-tack distal face opposite the proximal face to be repeatably optically coupled to the second end face. This resin composition is particularly useful for a resin film which is used for forming optical waveguides.