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An update...
Couldn't get my own dentist on Monday (he's only part time), but got to see him yesterday. Spent the afternoon getting root canal! Turns out that the tooth next the the one where I had already had root canal had started to die out. Dentist reckons it goes back to the original kicking incident.
Not as painful as I'm sure it could have been, he really is a brilliant dentist.
Tooth now tender but miles better than it was,
Mr P came and held my hand - he wouldn't wear marigolds, Mrs O, the meanie.