I know I was all right on Friday when I got up; if anything I was feeling more stolid than usual. When I went out to the kitchen to get breakfast Ainsley was there, moping: she said she had been to a bad party the night before. She swore there had been nothing but dentistry students, which depressed her so much she had consoled herself by getting drunk.

“You have no idea how soggy it is,” she said, “having to go through twenty conversations about the insides of peoples’ mouths. The most reaction I got out of them was when I described an abscess I once had. They positively drooled. And most men look at something besides your teeth, for god’s sake.”

She had a hangover, which put me in a cheerful mood – it made me feel so healthy – and I poured her a glass of tomato juice and briskly fixed her an Alka-Seltzer, listening and making sympathetic noises while she complained.

“As if I didn’t get enough of that at work,” she said. Ainsley has a job as a tester of defective electric toothbrushes for an electric toothbrush company: a temporary job. What she is waiting for is an opening in one of those little art galleries, even though they don’t pay well: she wants to meet the artists. Last year, she told me, it was actors, but then she actually met some. “It’s an absolute fixation. I expect they all carry those bent mirrors around in their coat pockets and peer into their own mouths every time they go to the john to make sure they’re still cavity-free.” She ran one hand reflectively through her hair, which is long and red, or rather auburn. “Could you imagine kissing one? He’d say ‘Open wide’ beforehand. They’re so bloody one-track.”