title: COMPARATIVE CHARACTERISTICS OF THE STATE OF HARD DENTAL TISSUES IN DRUG-DEPENDENT PATIENTS WHO USE HEROIN, AND METHADONE AS REPLACEMENT THERAPY
abstract: According to the Federal service for drug control in Russia, currently, 8.5 million people take drugs, including marijuana-6.2 million, synthetic drugs-1.5 million, and heroin-800,000 people. According to foreign and domestic literature, the population's consumption of narcotic drugs is continuously growing, especially in the youth and adolescence: in the structure of drug addicts, 20% are patients aged 9-16 years, 60% - 17-30 years, 20% - 30 years and older. Besides, many authors note the fact 
journal: PERIÓDICO TCHÊ QUÍMICA