Hi and welcome to HCM
Absorbabale sutures take variable amount of time to get absorbed, and it depends upon the material. It usually takes 10-14 days, but some sutures may take upto 8 weeks. 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.
Do not try to remove these earlier as that might cause gaping of the wound. 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.
I do hope that you have found something helpful and informative and I will be glad to answer any further query.