Hi Fiona, I am a dental nurse, and I have worked in Orthodontics. I really think you should get this tooth checked out, by a dentist. I know it can be very expensive, but the longer you leave these things the more they tend to cost in the long run! Also, it's not great for you or bub if you end up with an infection. The fact that hot bothers it makes me think that the nerve could be dying......Which can sometimes happen to teeth that have had substantial orthodontic movement. Sorry! Not the greatest news, I know. Also, canine teeth are really not teeth that you want to be taking out, so you'll probably need root canal treatment, which is not as bad as it sounds, just boring and expensive. Look on the bright side, I could well be wrong!!!! But do go and get it checked out. It's never a good idea to avoid the dentist when pg, despite what some people say. Dentists are trained to look after pg women, and know what is safe for you and bubs. GOOD LUCK!!! Let me know how you go.