This review of whether the incidence of osteoradionecrosis differed between patients who have dental extractions before or after radiotherapy (RT) included 24 studies (19 retrospective 5 prospective). While the findings suggest that the incidence is similar if extractions are undertaken before or after RT the quality of the evidence is limited.
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9 case-controlled studies were included in this review of the effect of marijuana use on head and neck cancer. The findings suggest no association marijuana use and head and neck cancer but other reviews suggest that this may differ by tumour site
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This review includes 11 case-controlled and 4 cohort studies and suggests a 37% reduction of oral cancer risk in high coffee drinkers compared with low or no coffee drinkers OR= 0.63 (95%CI; 0.52 – 0.75)
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