Yes, you are old enough to get crowns. The photo was too dark to see, so I couldn't tell how dark the teeth are. If the teeth themselves are a good shape,etc, then you could try internal bleaching to lighten them. I have used that successfully with many patients. They may redarken over time and...
It's always advisable to replace a missing tooth to ensure you don't suffer bone loss in the jaw and so your other teeth do not shift. But if you're having repeated problems with a crown it's a good idea to seek a few opinions so you can review your options. Not all crown materials are equal and...
This is not a difficult procedure. Search your area for a Prosthodontist and have the crown replaced. Most likely the bleeding is due to a less than ideal fit at the margin of the crown, or the previous dentist prepared your tooth too low below the gums. Either way, this...