Both of my mandibular 3rd molars are completely impacted and unerupted. They lie horizontally. The space between the gum covering these molars and crowns of the normal 2nd molars next them is very tight. I have difficulty keeping this small space clean. None of the cleaning tools (floss, tape, toothbrushes) are small enough to enter. \n\nI have recently been told that I have periodontitis and I am anxious to keep my oral hygiene to a very high level. \n\nThanks for any advice.