What are the contraindications of using aromatherapy oils and homeopathic remedies together?

Aromatherapy oils can cancel out the effectiveness of the homeopathic remedies which contain the essence or vibration of a substance. Peppermit, for instance, will negate the good effect of a homeopathic remedy. Instructions for homeopathic is to avoid brushing your teeth, use mouthwash, etc. before or after the use of any homeopathic remedy.