I like my Irish female dentist but today when I was head-down in the chair and she was drilling a filling, she and her dental nurse gave a little, 'oh,' followed by an embarrassed laugh and it made me wondered if suction please nurse was up to the job, or had I just swallowed a chip of mercury? Nice. When they were finished, I asked if I had filling on my face. Oh no. Outside in the street, I took out my hand mirror and there was grey dust on my lips and cheek. Pass the plastic sheeting and I can be Laura Palmer from Twin Peaks.