In the clinic often encountered some patients ask such questions, the following is introduced as follows; First, from the aesthetic: single crown is more beautiful, there is a gap between each tooth, if the porcelain teeth together to do, both with the crown, this gap is no longer, then the aesthetic discount. Second, from the cleaning: single crown can be used normally with dental floss, clean the foreign body between the teeth, so that the porcelain periodontal more hygienic, healthy, prolong the life of porcelain teeth. And ordinary even the crown can not reach. Third, from the re-repair: single crown such as a tooth problem, remove this one can; such as a crown even if a problem, generally to take down the crown together. From the chewing force: Generally, the chewing force of the crown is greater than that of the single crown, so if the tooth is slightly loose, the root or the tooth is short, it is generally better to consider doing the crown. Fifth, from the food embedding look: no normal contact relationship between the back teeth, resulting in food embedding, etc., more consider to do even crown. In a nutshell, single crown and continuous crown have their own advantages, that is, “inch has a long, foot has a short”; to listen to the doctor’s advice, the regular hospital doctors will be based on the dental situation of each person to reasonably design, develop a treatment plan to achieve better treatment and protection of teeth.