Enter email to receive results: Question 1 of 50 1. Tobacco use often causes:Extrinsic stainsPeriodontal diseaseOral cancerIntrinsic stainsQuestion 1 of 50Question 2 of 50 2. A heart murmur is usually a life-threatening condition and often requires pre-medication of an antibiotic prior to dental treatment.TrueFalseQuestion 2 of 50Question 3 of 50 3. The reason that phen-fen is no longer on ...