A health visitor has a very difficult job. They have to give information on a massive range of subjects to a wide range of people.
Unfortunately the average reading age in the U.K. is 11 , and that is amongst native English speakers.
In addition many people find any interaction with healthcare workers stressful and struggle to take information on board.
So therefore health information has to be given in an easily understandable and repeatable way. What a health care professional regards as research is peer review papers which help to form a broad scientific consensus. These papers are densely written and difficult to understand.
A health visitor, doctor, nurse will only have a couple of hours training , at most , on oral health and matters , so will rightly direct you to a dentist who studies for years , or to respected websites for further information https://abuhb.nhs.wales/files/patient-information-leaflets1/speech-and-language-therapy/information-for-parents-carers-helping-your-child-to-stop-using-a-dummy-pdf/
I am delighted that the correct information is given out in a readily understandable format and in a consistent way. When a health visitor may have to inform people on every aspect of care from serious health and behavioural conditions , to the basics of health, nutrition, growth and sleep , in a way that anyone , from those whose first language is not English , to those with learning difficulties , to the average person with a reading age of 11 , to the highly educated who want to question everything , I think we need to be mindful of what can reasonably be asked of them.