Thanks for contacting healthcare magic.
You complain that rotten egg smell from your mouth and
gingival recession in tooth.
Rotten egg smell may be because of
gastrointestinal infection condition. Infection of H.pylori may cause rotten smell. Irritable bowel syndrom may cause this symptoms.
Gastroesophageal reflux disease may cause rotten egg like smell.
Because of this may cause erosion on tooth area.
In your tooth root area is expose it lead to sensitivity and site at which food can lodge.
Clean the surface by flosss daily.
Daily use
chlorhexidine mouthwash.
Gargle with little salty warm water.That give relief in throat.
Brush you tooth at morning and night time.
Use Floss also.
Desensitized paste can use .
Avoid gaseous foods.Eat high fiber foods and drink more water.
Avoid stressful condition.
Take proper sleep.
For gastrointestinal infection stool examination test can do for further diagnosis.
After taking this much care still problem is present than meet general physician and for toothing problems meet periodotics.
Wish you a good health.
Take care.
Thanks.