The incremental proportion of small vessels proportion maybe result in a decline of the total blood flow in gingival, which may in turn impair the resistibility and restoration of tissue.

• 大管径毛细血管比例减少，可能造成牙眼组织局部血液供应不足，导致吸烟者牙周组织的抵抗能力和修复能力下降。