Hello & welcome,
Cavities always occur on the tooth surface not on the gums. If there is severe gingivitis
or infection of the gums along with swelling, then sinus may be seen due to pus formation.
* Always use soft tooth brush & check its bristle's condition every three months.
* Proper Brushing technique carries much more importance than the frequency of brushing.
* Apply light pressure while brushing by holding the brush horizontally against teeth surface & perform back & forth followed by up & down movements.
If there is swelling in your gums , Antibiotics can be used along with other drugs including serratiopeptidase
to reduce swelling & inflammation.
If there are caries in teeth, it can be treated with fillings if not involving pulp & by root canal treatment
if it involves pulp. So, visit your dentist
to check clinically location of cavity & get it treated accordingly.
If you maintain your oral hygiene
to optimum level by means of proper cleaning habits, then you can keep both the cavities in the teeth & gum diseases away.