The professional grade whitening systems used by dentists offer significantly better results in a single visit than the consumer kits sold in drug stores.
牙医使用的专业级别的牙齿漂白方法，以及一对一服务的效果比药店里出售的套装要好的多。
2
According to the FDA's letter-grade system for drug safety during pregnancy, most psychotropic drugs pose a potential risk to the fetus.
Objective To investigate the selection of lowest grade of injury in compensation of adverse drug reactions (ADR) for responsible parties, and analyse the characteristics.