Differences in susceptibility to dental caries occurs even under the similar, controlled conditions because of genetic variations, certain environmental factors are potentially more cariogenic for some individuals than for others. Salivary constituents differences may cause variation in caries susceptibility. This study was conducted to assess the salivary pH, flow rate and streptococcus mutans count in relation to oral health status among colored eyes adolescents. The study group included all 85 colored eyes adolescents from 6 secondary schools, while control group contained 85 brown eyes adolescents selected randomly from the same schools (12-15 for both groups, only males). Decayed, missing and filled teeth (DMFT), plaque (PlI), Gingival (GI) and calculus (CI) indices were used to measure oral health status for both groups. Salivary samples collection was done in the morning at least one hour after breakfast, then normal saline was added to have tenfold dilutions, to assess the total colony counting of the caries related microorganisms (streptococcus mutans), after that inoculation was done in the special selective media (Mitis-Salivarius-Bacitracin agar). Counting of bacterial colonies were estimated by the aid of dissection microscope. Salivary pH and flow rate were measured directly. The data of present study was analyzed using SPSS version 21. The median and mean rank values for DMFT, PlI, GI and CI indices were higher in study group than control group with high significant differences with regard to DMFT and PlI. A strong positive correlation was recorded between DMFT and PlI, GI, CI in both groups. Salivary pH and flow rate were lower in study compared to the control group (statistically significant difference with salivary flow rate). Higher mean value of salivary streptococcus mutans count among study group compared to control group with statistical significant difference. Dental caries experience and streptococcus mutans count were higher in colored eyes adolescents than brown eyes adolescents. Oral hygiene and salivary flow rate were lower in study group than control group.

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Background: The presence of a missing or peg shaped lateral incisor is a major concern for the subjects facial esthetics. Objectives: The objectives are to find the prevalence of peg shaped and missing permanent maxillary lateral incisors in Najaf City. Methodology: A cross sectional study was constructed and composed of 416 Iraqi students (215 males and 201 females) randomly chosen of 3 colleges of Kufa University in Najaf. Each subject was examined by visual inspection under day light looking for missing or peg shaped permanent maxillary lateral incisors. Results: The prevalence of missing maxillary lateral incisors was 3.8% (16 subjects) with an insignificant gender difference. There were two unilateral missing maxillary lateral incisor and 14 bilateral cases. Prevalence of peg shaped laterals was 4.3% (17 subjects) with an insignificant gender difference. Maxillary median diastema was found in 15.4% of the sample. Presence of missing lateral incisors showed a significant relationship with the presence of a maxillary median diastema. Conclusions: The presence of missing or peg shaped lateral incisors was found to be statistically significantly related to the presence of spacing and the presence of peg shaped lateral incisor showed a non-significant relationship with the presence of a maxillary median diastema.