The invention provides an antiplaque oral composition containing an orally acceptable carrier and an antibacterial effective amount of compound (I): In the structure, R1 and R2 are independently a hydrogen atom or a lower C1-4 alkyl group and R3 and R4 are independently an alkenyl or alkyl group having from 1 to 20 carbon atoms, with the proviso that R3 and R4 are not both 2-propenyl or n-propyl when R1 and R2 are both hydrogen atoms. Also included are oral compositions containing the compound (I).[0047]本發明提供一種抗牙斑之口腔組成物，其包含一種口腔可接受之載劑和一種抗細菌有效量之化合物(I)：；(I)；於結構中，R1及R2獨立地為氫原子或低級C1－4烷基，且R3及R4獨立地為一具有1至20個碳原子之烯基或烷基，前提是當R1及R2均為H時，R3及R4非均為2－丙烯基或正－丙基。亦包括者為含有化合物(I)之口腔組成物。
