Without pictures it's hard to say. Without pictures, I'm going to go with two 3-unit bridges (6-X-8 and 9-x-11). I've treated many missing lateral teeth cosmetic cases. These 3-unit bridges really does wonders. Post pictures then we can chime back in again with more...
Without a picture it would be hard to tell you with 100% certainty but it sound like you are taking about the translucent enamel at the edge of the tooth. If you have veneers or crowns, the ceramist may have added it, if it is within you natural tooth it is normal unless you find it...
I am so sorry that you are upset with the advise you have found from our dental community but the truth is sometimes not what we want to hear. If you have periodontitis, the gums and bones that support the teeth have been seriously damaged and teeth will loosen and fall out or have to be...