evidence: Saltwater gargles are easy and cheap to make. The ADA recommend adding half of a teaspoon (tsp) of salt to 8 ounces of warm water, then mixing until they are combined. [...] Gargling with salt water is considered safe for both children and adults. However, people who have trouble gargling should not use a saltwater gargle. [...] A person can safely gargle with salt water several times a day. There are typically no side effects. However, people with high blood pressure or those who need to limit their sodium intake should speak with a doctor before gargling with salt water.