Hello Maam.
It's really great that your mesiodens has fallen. It's an extra tooth and it definitely doesn't improve smile. Generally speaking gap between teeth is fairly common problem. So, the gap between your teeth can easily and quiet effectively be closed by Orthodontic treatment, which commonly is called braces or clip treatment. Now-a-days variety of options are available and it's really easy to use any to close the gap. Your treatment should take about a year or year and a half if no other problem is present. I suggest you consult an Orthodontist as soon as possible. Please don't worry. Your problem is quiet treatable and common.
Hoping that my answer has helped you a little.
Regards,
Dr. Arshita Singh (Orthodontist). Dentaire@BH, Dental Clinic, Road No 4, Banjara hills.
Next Steps
Kindly consult an Orthodontist.