I am very reluctant to label spirituality on to dreams, I don't believe they foretell the future but merely represent an aspect of your life either through your imagination, fears/hopes, conciousness or subconciousness. This dream could mean anything to you, question is, if you think about it really hard, what do you think it could be? Have you watched anything on telly recently e.g surgical procedure in a dental surgery. Have you had fears about your teeth or have had a bad trip at the dentist. Have you had fears about your physical health? Or it could be something more general an illness from someone close to you, a feeling of loss, the fact that it was a graphic dream could mean fear of being ill or that someone near is ill etc. The fact that you have had this dream more than once as you have stated is something more significant and something you might want to pay attention to with regards to its meaning although even a one off dream is still significant. Try and picture back how long or the first time you had this dream and what was happening in your life then that is still happening in your life now or that is still playing in your mind.