Unverified75% confidenceDecision RuleTime unknown
膨胀型牙线（干燥时细、遇唾液膨胀变粗）适合牙缝较大者，能更充分填充清洁；牙缝紧者用膨胀线反而更难通过
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75%
Confidence
Long-term
Relevance
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Unverified牙线棒越细越易入紧密牙缝，但过细的线体强度低、遇到卡牙时容易断裂残留；乳牙期在'易入'和'耐用'间权衡，选带涂层的膨体线可兼顾——干燥时细、遇唾液略膨胀贴合牙面92% similarUnverified牙周炎或牙龈退缩导致牙缝变宽的人群，应选膨胀型牙线（如海绵线/蓬松线）而非普通细线，接触面积更大清洁效率更高90% similarUnverified牙缝较宽或有牙周问题者选膨胀型牙线（如扁平膨胀线/牙线绒），入水或摩擦后线体膨胀能更好刮除牙菌斑，普通细线清洁面积不足90% similarUnverified线材越细清洁紧牙缝越顺滑但清洁面接触少去菌斑效率低；扁平膨胀型（进入干燥后遇唾液膨胀）线材兼顾细入缝与宽清洁，适合牙缝正常人群日常90% similarUnverified膨胀型（expanding/spongy）牙线遇唾液会变蓬松，适合牙缝宽或牙龈退缩人群清洁较大间隙，但对紧密牙缝反而难以进入90% similar
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