Tooth and Tree

Can you see the crack running down vertically from the junction of the two main limbs stretching up? This is the same old huge maple tree that my son and artist Matt Bua secured the base of their "tree house bridge" to.

My husband noticed the crack a while back. This tree is behind our house, very close to our house. I have since noticed a similar old maple tree at our soccer field with a similar crack. I wonder if this is a common old age affliction of maple trees. The huge limbs press upward full of strength for years, and then the weight of all that vigor and strength begins to succumb to gravity...and slowly, the huge vertical limbs start to pull away from their core....they come "unglued" so to speak.

We need a "tree guy" now to come tell us what to do. Can we wrap the tree with a huge steel belt,  to prevent it from splitting apart? Would that work? OR would he suggest lopping off one of the huge limbs, maybe the one looming over the roof of the house?

Meanwhile, and not so differently, I must seek the attention of the dentist to ascertain exactly what is going on deep inside my tooth. Does it have a similar crack that is slowly widening and allowing great gusts of cold air to hit an exposed nerve? Ot is it simply decaying gums exposing the root of the tooth? Which would be bettter? Which costs more to fix? or shore up? Can something be loped off to make it stop hurting?

That's all for now from Aging Acres....