ok heres my opinion on dream interpretation books - A LOAD OF OLD TOSH
No-one can know what a certain symbol menas to you personally, for example a dream of being given a red rose would have a text book meaning of romance, but you may have been given a red rose by a stalker, or cut yourself on a red rose thorn in the past so it would have a completely different meaning to you!!!
The most important thing when interpreting your dream is to think about how you would feel if it happened, so how would you feel if your teeth really did fall out? What emotion did you feel in the dream? Would you feel disgusted, insecure about your appearance, or would you be more worried about how you would eat? Would it seem a simple task to have them replaced with falsies, or would you feel like your world was over?
Then take something that is happening in your life now and try and match that feeling, it maybe that your sub-conscious is trying to tell you about a feeling you are bottling up, something that you need to face up to.
Teeth falling out is one of those dreams that everyone gets, which suggests its a potent message, but it doesnt mean its the same message for everyone!