In the following description of the relationship between halitosis and periodontal disease. it is correct

A、thelowconcentrationofVSCdoesnotconstituteaperiodontaldestruction
B、ammoniaandorganicacidscancausethedestructionofperiodontaltissueandcells
C、thedepthandquantityofperiodontalpocketswerepositivelycorrelatedwithVSCinbreath
D、thepathogenicbacteriaofperiodontitiscannotproducevolatilesulfide
E、Routineperiodontaltreatmentcombinedwithproperoralhygienemeasurescanimprovehalitosis下列關於口臭與牙周病關系的描述中，正確的是A--低濃度的VSC對牙周不構成破壞B--氨--有機酸能造成牙周組織及細胞的破壞C--牙周袋深度及數量與口氣中的VSC呈正相關D--牙周炎的致病菌不能夠產生可揮發性硫化物E--常規的牙周治療結合正確的口腔衛生措施可改善口臭