Hello and thanks for the query
The internal stitching takes about 10-15 days to absorb depending upon the type of thread used. Yes you have to rinse your mouth after every meals or drink and make sure that no food particle is attach to the stitched area. No other care is required. Continue the course of antibiotic as prescribed by your doctor. Take semi-liquid diet
and avoid hard and heavy diet.
Can do Betadine
gargles or lukewarm water gargles for better effect. Consult your doctor for that.