YOU SAID:

My cat had an appointment to remove one of its tooth

INTO JAPANESE

私の猫はその歯の1つを取り除く約束をしました

BACK INTO ENGLISH

My cat promised to get rid of one of its teeth

INTO JAPANESE

私の猫はその歯の1つを取り除くことを約束しました

BACK INTO ENGLISH

My cat promised to get rid of one of its teeth