Why do I feel sensitivity after tooth bonding, even though I did not before it?

Resin bonding -Doctor did not tell me much -two teeth on bottom row right below buck teeth -broken teeth due to a construction accident (though there was no blood, pain or sensitivity until after the bonding -Will the sensitivity subside? -is a root canal necessary? -it has only been a day since my treatment - I'd like to note that the doctor cleaned my teeth before this procedure, whereas they were not clean before.