Beers are broadly divided into two categories: top-fermented ales and bottom-fermented lagers. Stouts are a type of ale that uses slow-fermenting yeast that evolved out of the porter style. Stouts tend to be thicker, darker, opaque beers with higher specific gravity - similar to milk. They are usually less bitter than other ales, and typically exhibit tones like chocolate, coffee, oatmeal, and milk.
Foods that are sharp can scratch the tissue, leading to discomfort. Spicy foods or foods that are extremely hot or cold can also cause the roof of the mouth to become damaged, leading to swelling or pain. Tobacco use can also damage the tissue, leading to discomfort on the palate.
1 Persistent bad breath or a bad taste in the mouth can also be one of the warning signs of gum disease; which is caused by plaque.  Dry mouth. This occurs when the flow of saliva decreases and can be caused by various medications, salivary gland problems or continuously breathing through the mouth.