The dentist are verse similar to Hecks, while being much smaller than Hebbs.
While the dentists have almost no volume, they play a very important role in the "Heck" series. The dentists are the only ones to have their own gravity, keeping the entire chain stable.
Not only does the dentists have gravity, it also have a magnetic pull to it because tetracontatrimillinonoctpentium, when combined with oxygen, make a metal. Oxygen is often found outside the dentists, so they have a magnetic pull.
While the dentists play an important role, they're very hard to see because it would look like a speck of dust to, say, entities like Dave. For this reason, the dentists are very protected with negative-dimensional objects.