[Everything doTERRA] mouth sore after clove and oregano use

Hi there
Im fairly new to the oils and my husband had a flare up with one of his teeth that is in need of a root canal. He was in pain so I suggested he apply clove oil (1 drop directly on the area of the gum where the pain was) and then as it got worse said to add oregano as he didn't have any antibiotics and thought this would be better.. I know they are hot oils but didn't expect the result. After just 3 applications over 2 days, the corner of his mouth where the oils also touched has burnt and scabbed over but more worryingly, most of one side of his upper gum is extremely sore and looks like damaged tissue.. I feel awful as he's not really inclined to use the oils as I am but he took my advice. The gum looks like it has white sores all along and on the top where the gum meets the upper lip, looks like a huge ulcer. Pls pls pls help. He really doesn't want to use any more oils on it but if I knew something would definitely work I'd try to convince him.
Many thanks
Annie

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