[Everything doTERRA] Taste in the back of the mouth from oils?

Wanted to find out if anyone has had any experience or find out why you would have a menthal taste on the back of your mouth. My mom has been using the Aroma Touch oil 2-3 times daily since November and she said she has a taste in the back of her mouth. She uses them on her feet and legs. Anyone know anything on this?

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