Unfortunately for me, at around 28 weeks, a piece of my filling cracked off my tooth and I had to rush around to find a dentist who would take me as a new patient.
My OB's office suggested that I get it fixed asap, and, because it was an old mercury-type amalgam filling, I was worried that the 'fumes' might harm myself and the baby. Luckily, the procedure took only a few minutes; but, sitting in the dental chair was a weird experience. When they put the chair back, it felt as if my whole belly went completely flat, and that baby was nowhere to be seen!