Replacing bridge with implants? (photo)

15 yrs ago I cracked my front tooth; the dentist extracted the tooth & then shaved down the 2 teeth on either side &created a bridge. My gum is receeding where tooth was extracted AND I'm also starting to see root(?) above my natural teeth on either side of the bridge. 1) Should I replace 3 tooth bridge w/ 1 crown & veneers over the 2 shaved teeth? 2) what can i do about the natural teeth that are showing root near gum line? 3) my natural teeth are now not as white as the 3 fake ones.