Background: Alcohol intake is the third largest risk factor for disease and disability in the world. Long-term excessive alcohol consumption affects bone metabolism and may play a role in bone loss along with the decreased salivary flow, halitosis, and increased tendency to periodontal disease. Objective: To assess the influence of alcohol consumption on the prevalence and severity of periodontal disease. Search and Selection Methods: A search for studies on alcohol and periodontal diseases was conducted in the following databases: PubMed (MEDLINE, Cochrane Library), Web of Science (WoS), and Scopus. Data Analysis: For dichotomous outcomes, the estimates of effects of an intervention were expressed as odds ratios (OR) using Mantel-Haenszel (M-H) method and, for continuous outcomes, the estimates of effects of an intervention were expressed as mean differences (MD), both with 95% confidence intervals. Results: 21 studies were included in this meta-analysis. Drinkers were 1.51 times more likely to develop periodontitis than non-drinkers (p<0.001). Likewise, heavy drinkers increased BY 2.51 times the periodontitis risk (p=0.03). Alcohol consumption worsened periodontal parameters, causing a significant increase in plaque index levels (MD: 4.06; p=0.04), probing depth (MD: 0.33; p<0.001), and clinical attachment loss (MD:0.33; p<0.01), but not bleeding on probing (p>0.05). Conclusions: Alcohol intake increases the periodontitis risk. This risk is even higher the more alcohol is consumed.