Abstract: Different methods were used to tan the tussah powder by bacteriostasis experiments,It was found that suing tea poly phenols as the tan additive,the tanned tussah powder showed strong inhibitory effect on the main oral pathogenic bacteria and dental caries bacteria, and 3× 103CFu/ml MIC of the minimum consistency of bacteriostasis to the P.micros is 0.075mg/ml,to the main mutation of the S.mutans, the 3× 106CFu/ml, MIC is 0.15 mg/ml. Please attend to the fact that this kind of elememt canbe used to prevent teeth from being dlecayed.

Key words: Extract Tan Tea tanning Inhibitor