Hi B.. Just thought I'd chime in and recommend the work of Dr. Weston A. Price. It's fascinating and does show strong links between what we eat and our dental health-- and that the state of our teeth reflect all of our health in general. He does recommend cod liver oil, among other "special foods" like organ meats and high vitamin butter to name a couple.
His book, "Nutrition and Physical Degeneration" has many photographs to back up his research. These photos show the proof of whole foods' (no flour, no sugar, no processed) effect on the outcome of teeth (meaning the body is in a good state of health) and their development, even having the ability to reverse decay, and, affect facial shape. Many people and conventional medicine, understandably, find it hard to believe so it's best to inform yourself. Google him and also Ramiel Nagel's "Cure Tooth Decay".
I'm sure the woman was trying to kindly share with you some info that was more commonly known years ago. I was blown away when I discovered it myself, especially about raw milk and how many "official groups" that are against healthy things often have money ties to industries that profit from our ill health.
Hope this helps and that you can find stuff out for yourself with an open mind. Oh, also, cod liver oil is recommended, but in moderation, as all things. Don't overdo it because there can be toxicity. So read up on it if you go this route. Good luck!