When my bottom teeth hit the back of my crown while biting it hurts. I have had a root canal done on this tooth as well.

Gums tend to regrow around implants when abutments and crowns are removed....to a point and in limited amounts. It really depends. You need to consult a periodontist who specializes in gums and he or she will tell you what should be done long term 

From the photo, the crown doesn't look too bad but if it is at all bigger than your original tooth, which may have been compromised because of wear,breakage,filling,etc, it will feel big to you. . The crown may be going a little deeper under your gums in order to extend beyond the filling for a...

In order to take an impression for a crown, a small string or cord needs to be tucked under the gum all around the tooth. For most people this can be uncomfortable and it is important that it be done well to get a good impression.

Number one, the crowns do need to fit very well at the margins and be cleansable(that is, not bulky). Stick with your fluoride mouth rinse and perhaps have a fluoride varnish treatment whenever you have your teeth cleaned. Great job on the brushing and flossing...you are doing what you need to...

You probably did have a root canal on this tooth. The darkness on your gum is the dark root showing through the tissue. Puffiness on the crown can be cause by several things. You crown may not fit well or may be too thick at the gumline. Another possibility is you may have a sensitivity to any...

It does sound like the post has become loose.  It is very important that you have this redone soon as you can get decay in the tooth that can quickly destroy what is left.  Find a good esthetic dentist who can determine if the tooth is savable and if so, what it will take to properly...