1) Raw Liquor
A great home remedy to get rid of mouth sores is to soak a cotton swab in raw liquor and then press it onto the spot for about two minutes.  You should notice that the sore will be healed in about two days.  Keep in mind that this will burn and cause quite a bit of discomfort, but you'll be happy to see the fast results.

2) Tea Tree Oil
Mouth ulcers can be quickly healed using tea tree oil.  This is a great natural remedy that will immediately relieve any pain and also has wonderful natural antiseptic properties.  This is important because these properties promote healing and help the sores to heal faster.

Simarouba Leaves

3) Vitamin and Mineral Deficiency
While not quite a home remedy for mouth ulcers, it's important to understand what can cause them.  Mouth ulcers are typically caused by low levels of iron or low levels of B12.  If you are deficient in either vitamin or mineral you may find sores developing frequently.  Instead, have your levels checked and consider taking a supplement if your health care professional recommends.
 
4) Magic Homemade Mouthwash
While not quite a home remedy for mouth ulcers, it's important to understand what can cause them.  Mouth ulcers are typically caused by low levels of iron or low levels of B12.  If you are deficient in either vitamin or mineral you may find mouth ulcers developing frequently.  Instead, have your levels checked and consider taking a supplement if your health care professional recommends.
 
5) Simarouba Leaves
Boil simarouba leaves in clean, filtered water for approximately ten minutes and allow to cool.  Then, roll them inside your mouth and drink.  You'll find that this is a great way to get rid of mouth sores.
 
6) B-Actif Comfrey Extract
Try B-actif comfrey extract. You should only need one drop on the spot and it'll heal quickly.  Be sure that when you go to purchase this, you ask for the extract and not the tonic.  The tonic is plant food and will not work on mouth ulcers.