Do I need Frenectomy?

[ELA]

I had my braces removed in May 2014 and a lingual retainer was placed. On Sept 8, 2014, I noticed that there was a small gap between my two front teeth, then on Sept 11, 2014, the gap became bigger. My 2nd upper premolar is also missing. According to my Dentist I need a Frenectomy. Before I had my braces, my two front teeth was kinda overlapping (since it came out as a permanent teeth.) So I don't understand why all of a sudden I need a Frenectomy. I went to 2 other Dentists and they didn't recommend the same. I attached some photos for your reference. Sorry for the not so clear photos. But I still hope you can help me.

 

[ELA]

Note: All the other IMG-titled photos are current.

 

[Dentgr]

I believe that the retainer is no longer bonded on your right central incisor. Should also check periodontal condition.
If you pull your upper lip upwards does the tissue in between the two incisors go white?
If yes you may need frenectomy.

 

[movemen]

looks like frenectomy might needed to relieve the pulling of gums and eventually separating the two central incisors