After root canal therapy, post placement, and internal whitening, the gum tissue around and above my tooth appears to not be as flush in pink color over the years. Are there possible procedures to whiten the root of a tooth after a post has been placed? Looking for specific treatment options. Cost has no weight in fixing my smile. Separate issue is darkness of margin of tooth, which, as stated by a doctor on the site, could be due to crown length causing inflammation. Advice would be appreciated