Ok, so I went to Vanarom Dental Clinic and everything went smoothly (smooth as silk!). I stay around 45 minutes, the doctor was very attentive and also told me the price before 1.) Cleaning part of my mouth (only one part, justified, I didn't clean it since... well, many years 2.) Fixing the cavity. I paid 1500 + 1500, = 3000 baht. I'll certain use the same dental clinic and the same doctor next time.