I had my braces on for about four years and 2 weeks ago, I had them taken off. I got my retainer a week later and I've been wearing it day and night. Recently, I noticed that one of my bottom front teeth is loose. It feels so fragile and I am worried, it might break off when I happen to bite down hard on foods. Is this normal? I don't want to lose this tooth. Please help and thank you very
much!