Hello, Your description sounds like thrush, also known as an oral yeast infection. A common side effect of amoxicillin treatment is a disturbance to the oral flora. This bacteria in the mouth gets out of balance. A fungal infection occurs and you will need a prescription treatment such as nystatin. If your mouth is overly inflamed, ask for a prescription rinse which can have a combination of an antifungal medication, anti-inflammatory medicine such as a corticosteroid, and anesthetic. You should be rinsing with warm salt water and practicing good oral hygiene. Make sure to brush your tongue as a film may appear on the tongue with this condition. Keep well hydrated and follow a proper diet. Make sure you do not have any vitamin deficiencies. Take anti-inflammatory medication such as acetaminophen and ibuprofen. Benadryl, antihistamine, also has anti-inflammatory benefits. A visit to your dentist is recommended and make sure you have a routine dental exam to rule out any other possible dental infections or complications. Keep in close contact and update your physician on any dental diagnosis especially with your reoccurring respiratory disorders. You may have a resistant respiratory infection that may require different antibiotics or combinations to resolve the situation. Thank you for your inquiry. I hope you will feel better soon and that my suggestions are useful and help you feel better soon.