Is mouthwash now a cheap cure?The short answer is no.While the research suggests use of mouthwash may help kill the virus in saliva, there is not evidence it could be used as a treatment for coronavirus, as it will not reach the the respiratory tract or the lungs.The university report states that mouthwashes containing at least 0.07% cetypyridinium chloride (CPC) showed signs of being able to eradicate the virus when exposed to the virus in a lab.Dentyl is the only UK mouthwash brand to have taken part in the 12-week clinical trial, which was led by Professor David Thomas.Dr Thomas said: “Whilst these mouthwashes very effectively eradicate the virus in the laboratory, we need to see if they work in patients and this is the point of our.