Much to the disappointment of her mother who thought "fumb" was cute, I once taught a 3-year-old how to pronounce "th" by telling her to stick her tongue betwee

Much to the disappointment of her mother who thought "fumb" was cute, I once taught a 3-year-old how to pronounce "th" by telling her to stick her tongue between her teeth and breathe out. Maybe a similarly position-focused (rather than sound-focused) approach would help non-native speakers as well?