It is not safe to ingest essential oils, either straight into the mouth or diluting in water or other liquids - I do not encourage in my practice in any form. The use of inhalation & applying topically is more effective and safe, when used as directed. Never use neat, especially on babies, toddlers & children. The only essential oils safe to use neat (for adults) are Tea Tree (melaleuca alternifolia) or Lavender (lavendula angustifolia). Essential oils should only ever be used under the strict guidelines of a qualified Aromatherapist / Aromatscience Practitioner.