Washington suffered from many illnesses over the years, and many of the treatments (such as blood-letting and the use of mercurous chloride) were destructive to his teeth. Washington used tooth powder regularly, but he still had regular toothaches and eventually lost his teeth. His favorite dentures were made of hippopotamus and elephant ivory held together with gold springs. He had only one natural tooth remaining when he became President, and his short inaugural address was limited due to the pain that he felt when speaking.
One of the more interesting points I've read contends that the reason the South, led by Virginians, were so pro-Revolution was that they were deadly afraid of slavery -- meaning what a tyrannous British government could do to them in the Colonies. This view arose because Virginians witnessed slavery firsthand, and saw that unchecked political power in the hands of one group always is used to crush those not part of the group. In short, they were afraid of being reduced to the same level by their brethren in Britain as they had reduced their own slaves. Interesting motivation....
Slavery was a key element during the Revolution. The writers of the Declaration of Independence are talking about freedom and equality, how could this not affect those in slavery listening? Many slaves fought during the Revolution in the hopes that the freedom they were fighting for would at the end of the war, extend to themselves.
If you want to watch a good movie, and see a little of this idea in action get Mel Gibson's The Patriot. There is a very interesting African American character fighting in it. It is not a true story but a well written one about attitudes towards African Americans and slaves and their feelings about the Revolution.
The slaves were used and abused by both sides in the Revolution. The main use of them was by the British. The British tended to offer them freedom in exchange for their help against the colonists. This was meant to hurt the colonists who, in the South particularly, relied on slaves.
And Washington's teeth were not made of wood. He had lots of dentures, none of wood. Most were made of ivory of one sort or another.
In answer to your first question, yes slavery was an issue in the American Revolution. In drafting the Declaration of Independence and Constitution, there was a compromise in that they decided to deal with the slavery issue later rather than lose the new country because the slave colonies refused to give up the right to slaves, since the economy and way of life depended on them.