After I came home after school, I went to the dentist too clean my teeth. Usually, the dentist will take an electric drill and start cleaning, but this time, it's different! He took out a wierd instrument, connected to the machine, put a green cloth on my face, and start cleaning. It was extremelly pain, and sometimes, when the liguid shots on my tongue, I felt my tongue burning. When the dentist finish cleaning, I found that there was blood drop in between the teeth! to avoid cleaning my theeth againg, I vow to wash my teeth more carefull everytime.