Thanks for the query.
Looks like you have developed a sudden bacterial or viral pharyngitis and oral inflammation.Kindly do warm saline gargles 3 to 4 times a day, avoid very cold or very hot food items and liquids, steam inhalations may help. Drink plenty of water and you may take an anti-inflammatory medicine for pain relief. See an ENT specialist for an examination and antibiotics till complete cure. Maintain oral hygiene. Avoid smoking, alcohol and other spirits.
Hope this helped.
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