How long does the oral ulcer patch last?

If oral ulcers are painful, when we speak, we are likely to show our own heart pain when we eat, so it will affect our daily life, so we can use oral ulcers to stick on the surface of ulcers, which can promote ulcer healing. For example, oral ulcer is on the edge of gums, we can buy oral ulcer paste on gums, so the first can play a mechanical protection role, so it can promote ulcer healing, second, ulcer paste drug ingredients can play a drug role, so it can also promote ulcer healing, generally four hours to five hours or so change a piece, that is to say, oral ulcer paste four or five hours change once, general oral ulcer paste 5 to 6 days can be good.