Medications and antidepressants can cause dry mouth (lack of saliva). It's not surprising that doctors who are only interested in conducting business as usual in order to exploit you for money don't have the motivation to explain that. Saliva is important for digestion and tooth enamel health. So, of course the doctors COULD take the time out to REALLY help (you can bet they take better care of themselves and their families).
OP would definitely be something you should do for the whole body, but also consider that chelation might be necessary if you have Amalgam tooth fillings.
When you drink orange juice or anything acidic, don't let the aftertaste linger in your mouth (rinse it out) because the acid corrdes the tooth enamel.