You should see your dentist every 6-12 months for a general check up and clean. Patients who have required fillings at their last check-up, have early signs of decay or have gum problems are all recommended to see their dentist routinely every 6 months. Your dentist will normally inform you what time frame is recommended for you personally.
Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.