The LDS Church currently teaches they have the fulness of the temple ordinances and all that God intended to reveal on the subject. Again, I totally disagree. The LDS Church did not previously believe or teach they had the fulness of the temple teachings. That is a recent claim and is simply not true.
“You, to be competent in teaching your children, must first have the Holy Ghost as your guide. Then, once you have that, you ought to have familiarity with the scriptures, just as Hyrum was told to first learn what was in them before trying to teach others. Then you are qualified to go and teach your children, and you have an obligation to do that. Children are the means to preserve Zion. Without the conversion of children, Zion has no chance of surviving.” (Denver Snuffer)