I saw a patient yesterday who was a year old. The upper left 6 tooth was split and the x-ray showed that it was cracked to the apical 1/3 of the root and had to be extracted. When he came in last year, he had a chronic apical abscess with a fistula and second degree loosening. At that time, the patient was advised to go to the endodontics department for a complete root canal treatment to try to retain the tooth, and it took about two months to treat this tooth, which was finally OK. At that time, I repeatedly instructed him to follow up in two weeks for a crown, but he was always busy …… and never came, which eventually resulted in an extraction. The cost of restoring the missing tooth later is not mentioned first, alas …… Advice to patients, what the doctor tells you is called medical advice, be resolute in carrying it out! You do not trust him can not choose him to do your doctor, once you choose to believe him, listen to his instructions, otherwise the consequences will be very serious, very bad for your teeth, when the time to suffer is your own, and most likely there is no remedy. Doctors are also people, human capacity is limited, please do not use your laziness to challenge the doctor’s ability, the final harm can only be your own.