Dental Care IQ Test Dental IQ Test Name* It is necessary to have a root canal before having a crown.*TrueFalseSpending an hour with powerful bleach whitens teeth better than spending an hour per day with moderate strength products for two weeks.*TrueFalseOne should spend a full two minutes brushing teeth, two times per day, and have a professional prophylaxis (cleaning) at least every six months.*TrueFalseWhen a root canal is done, a root of the tooth is removed.*TrueFalsePhosphoric acid in soft drinks and sodas can make holes in teeth.*TrueFalseWhen a tooth is prepared for a crown, the dentist shaves the tooth down to the gum line.*TrueFalseIt is fine to drive an automobile after receiving nitrous oxide (laughing gas).*TrueFalseIn order to have a crown or bridge made, it is always necessary to have impression material placed in the mouth.*TrueFalseWhitening teeth harms enamel in a significant number of cases.*TrueFalseCrowns done on front teeth always have a dark line near the gums.*TrueFalse This iframe contains the logic required to handle AJAX powered Gravity Forms.