Hi,
Thanks for asking the query,
According to your clinical symptoms i suspect that you have developed severe infection in the mouth this ca be due to poor
oral hygiene, plague and calculus deposition, systemic diseases like
diabetes,
hormonal imbalance.
I would suggest you to visit the
Dentist and get the thorough checkup done take an OPG radiograph.
Go for symptomatic treatment of complete mouth scaling and polishing.
There cannot be a mercury
poisoning because of dental filling it occurs when you engulf large amount of mercury accidently.
Use a desensitizing toothpaste along with a soft bristle toothbrush.
Use antiseptic mouthwash gargles.
Also get your blood sugar level analysed.
Maintain a good oral hygiene.
Hope this helps out.
Regards..