Tooth extraction aftercare--how can I help an elderly person avoid infection and heal well?

Keeping area clean. On the day of extraction apply ice pack on the side from outside. After 24 hours start rinsing with warm salt water. Sometimes antibacterial mouthwash like Peridex (chlorhexidine gluconate) mau be recommended by the dentist. The rinsing should be done at least 5-6 times daily especially after any food intake.
Many ways. Be certain there well-nourished and in stable health before the procedure. Informed the surgeon of all medications being taken orally. After surgery keep the diet liquid or one that can be swallowed without chewing for five days. No smoking. Lightly brush and thoroughly rinse surgery area with a disinfectant. Follow all instructions of the surgeon. Add probiotic bacteria like kefir yogurt.