I've just had a tooth extracted yday 20 months after ds3 was born (toothache nearly 1yr and root canal 8 months ago but didn't work). I had another extraction 2 weeks after ds1 was born (abscess on top of root canal). I know the theory that you lose a tooth for each child but is it true? As my dh pointed out, none of my friends have had dental extractions, so is it just me?