{"appears_in":[{"position":4,"ranking_slug":"best-dental-floss-2026","ranking_title":"2026 年牙线买哪种：PTFE 单丝、膨胀线、含蜡尼龙线，先看线材再看单价，10 款主流牙线与牙线棒横向对比","score":8.6,"url":"https://www.bestitemlist.com/ranking/best-dental-floss-2026"}],"brand":"GUM（Sunstar）","buy_url":null,"canonical_url":"https://www.bestitemlist.com/product/gum-expanding-floss","category":{"name":"牙线","slug":"dental-floss"},"cons":["牙缝极紧者膨胀后可能难以拉出","牙缝已明显变宽者应直接用牙缝刷","国内产品线庞杂，膨胀款与普通款包装相近","单价高于普通含蜡尼龙线"],"description":null,"id":"4a62377acb71405774ca211ff5c33f60","image_url":null,"name":"GUM 康齿家 膨胀型牙线","official_url":null,"price":{"currency":"CNY","max":70,"min":25},"pros":["兼顾穿入容易与接触面积大","对轻度牙龈退缩人群针对性强","Sunstar 在牙周护理产品线上积累深","线材柔软，对牙龈刺激小"],"release_year":null,"slug":"gum-expanding-floss","specs":{"形态":"线卷","线材":"膨胀型纤维（遇唾液蓬松）","品牌背景":"日本 Sunstar 旗下口腔护理品牌","适合牙缝":"正常偏宽 / 轻度牙龈退缩"},"summary":"遇唾液膨胀的纤维线材，干燥时细好穿入、湿润后变蓬松刮得到，专为「牙缝略宽但还不用牙缝刷」的过渡状态。"}