Hello,
I want to assure you that there is no keeda(insect) in your mouth.
Keeda is a layman's term used by the Dentists to refer Dental Caries
So, you don't have keeda or any kind of insect in your mouth but you have Dental Caries
Dental caries is a scientific term for tooth decay or cavities.
Next Steps
Get restorations/fillings done for all the carious teeth in your oral cavity.
Health Tips
Brush at least twice a day and rinse after every meal.