it is a cross-sectional study for assessment the impact of socioeconomic status on periodontal health through using a definite scale mentioned in the protocol related to the middle east people.

Recently, definition of periodontal health has been developed dramatically from just the absence of a disease to a state around a stable periodontium (Lang and Bartold, 2018) that functions in comfort in an individual with psychological and social well-being about their mouth (Mariotti and Hefti, 2015). Based on this, biological, environmental, systemic, social, economic and psychological factors can affect periodontal health in different ways.

Periodontal examination using the community periodontal index (CPI) will be done for all of the participants to assess the status of periodontal condition. The CPITN criteria used in this study will be as follows: score 0 = healthy periodontium with no sign of periodontal disease, score 1= gingival bleeding on probing, 2=calculus deposits, 3=pockets 4-5mm (shallow pockets), 4=pockets 6mm or deeper (deep pockets) and X =excluded sextants.

Periodontal diseases have been categorized in a new framework: stage I to VI of periodontitis based on severity, complexity of management with additional described extent as localized or generalized. Grade A to C of periodontitis related to the progression rate of the disease as slow, moderate and rapid with grade modifiers. The seriousness and the complexity of the disease are greater as the grade increases within each stage.(Tonetti, Greenwell and Kornman, 2018).

Information on loss of attachment (CAL) will be collected from the same index teeth using CPI modified system. The two molars in each posterior sextant are paired for recording and if one is missing there is no replacement. If no index tooth is present in a sextant qualifying for examination, all teeth present in that sextant are examined and the highest score is recorded as the score for the sextant WHO.

Patient-centered approaches turned to be more popular, which increased the attention to the effects of different human health situations on periodontal health through the concept that the way in which an individual' lives may produce behavioural patterns that are either beneficial or determinable to health including socioeconomic status.

Social class will be classified according to following socioeconomic status scale for health research in Egypt into low, moderate and high socioeconomic subgroups described by El-Gilany et al. (El-Gilany, El-Wehady and El-Wasify, 2012) This scale includes 7 domains with a total score of 84. Socioeconomic level: to be classified into very low, low, middle and high levels depending on the quartiles of the score calculated.