Thank you. You will see that a similar question came up recently. This is an illness called herpes stomatitis. The correct tretament is Zovirax and your other twin should be on the same medicine. Apply Teejel to the painful ulcers in your children's mouths. Do not use Stopayne which contains codeine and causes constipation and dependency.If they will not eat or drink they need to be seen in a paediatric emergency unit as they may need rehydration.
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