Prediction and dentist

Went to a dentist today.
Spent half an hour waiting and then half an hour sonic cleaning my teeth. At first we made an appointment to replace filling on my front teeth, but she was very busy with emergency patients and couldn't concentrate on me. So I had to move my filling appointment to August 31st.
What a shame since I was ready for it. Morally and money-wise.
Cannot really blame her.
As I modified one man's saying 'The best prediction you can make is be 99% sure that a man standing in front of you that you are about to shoot from your gun is going to die'. Anything else is beyond our power of assurance and prediction.