Located in vestibule of mouth the heavy labial wire did not oppress gum influence facial appearance make mouth unwell .

粗唇弓前方位于唇系带附着点（ 牙合） 方 的 口腔 前庭，既不压迫牙龈、强撑口唇，也不影响患者外观和口腔功能，口腔不适感小。