I guess you have a metal ceramic crown, if your unhappy with it then go for all ceramic crown which truly resemble natural teeth. Regarding gap in your lower teeth. You can go for composite filling or reshaping and filling the gap using crowns!
Get a chekup done with a dentist, he might suggest different options to close gap in your lower teeth which may involve veneers, composite fillings or orthodontic treatment and for your capped tooth the crown might hav to be replaced with emax crown for best looks!
If you are not convinced with the aesthetics of your currrent upper cap, or it hasn't been color matched properly get it replaced with highly aesthetic all-ceramic (3m) cap. Gaps between your lower teeth can be permenantly corrected only by fixed orthodontic braces.
We can correct this with smile designing. The gaps in your lower teeth can either be closed with a procedure called bonding or by doing ceramic veneers. If the cap that you have does not look good, you can go for an all-ceramic cap. And if any tooth is missing, you can opt for dental implants in that area.
Suggestions offered by doctors on Lybrate are of advisory nature i.e., for educational and informational purposes only. Content posted on, created for, or compiled by Lybrate is not intended or designed to replace your doctor's independent judgment about any symptom, condition, or the appropriateness or risks of a procedure or treatment for a given person.