The failiers in fixed prosthodontics are very dangerous on the health of the periodontics. This study aims to early diagnose the periodontitis caused by the failiers in the designe and application of fixed prosthodontics. The study sample consists of 15 abutments in 15 patients aged (15-50) years with fixed prosthodontics aged (1-3) years. (Average 2 years) The results show the negative effect of bad prosthodontics on the absorbtion of the buccal cortical plate due to very long margines of the prosthodontics, the leakage of the adhesing cement and the beveldsholdermargines that play a role in changing the periodontal biofilm.