Table 1. Socio-demographic data and dental history of participants .

variable	classification	frequency	percentage
age	50 years old and less	73	36.5%
	More than 50 years old	127	63.5%
sex	Male	88	44%
	female	112	56%
Educational level	No academic	141	70.5%
	academic	59	29.5%
Smoking status	Smoker	101	50.5%
	Non smoker	99	49.5%
Knowledge	Good	73	36.5%
	low	127	63.5%
Type of diabetes	1	12	6%
	2	160	80%
Duration of disease	Lower than 10 years	136	68%
	10 years and more	64	32%
Cause of tooth extraction	Mobility	4	2%
	caries	54	27%
	Mobility and caries	89	44.5%
	No missing tooth	53	26.5%
Frequency of brushing	No brushing	99	49.5%
	Once a day	87	43.5%
	Twice a day	14	7%
Referring for dental visit by physician	Yes	142	71%
	No	58	29%
Frequency of dental visits	G1§	166	83%
	G2§	34	17%
§individuals who have regular dental check up
§§Individuals who have not regular dental check?up and visit the dentist only when have a dental problem