Among the BC-related studies, five [38,39,40,41,42] investigated the impact of aromatase inhibitors (AIs), including anastrozole, exemestane and letrozole, on periodontal health, two studies [43,44] focused on tamoxifen, while the remaining five assessed the effects of both tamoxifen and AIs [45,46,47,48,49]; of these three provided separate results for each drug. The gene discussed is CYP19A1; the disease is breast cancer.