here are some quotations for research. Also, acidic foods such as fruit juices, sodas and Sugar can cause softening of the enamel and brushing right away may strip away minerals from the teeth - thus weakening the enamel.
recomendation: rinse with water and wait at least one hour to brush. This is what some of the reports said.
“The mouth can also be affected by thiamine deficiency (B1), increasing the sensitivity of the teeth, cheeks and gums, as well as "cracks" in the lips. Fortunately, these conditions can be reversed with the addition of the vitamin.”
“Vitamin D helps the body absorb calcium, and without it, bones are weakened. Vitamin D is needed to help the body absorb calcium and phosphorus, which help growth of bones and teeth. In addition, vitamin D regulates whether these minerals are deposited into bone or withdrawn out of it. If minerals are drawn out more than they are put in, this can leave bones soft and weak. ”
“Vitamin D deficiency in adults results in a condition called osteomalacia. It involves the loss of calcium and protein from bones, due to insufficient vitamin D. Osteomalacia differs from osteoporosis in that bone loses only mineral. In osteoporosis, bone itself is lost.”
“A new study which appeared in the General Dentistry journal suggests that people who are sensitive to bright light, loud noise, itchy clothes and strong perfumes are also likely to have sensitive teeth. This means// that such a person is likely to avoid very hot or very cold foods.
The study confirmed that sensitive teeth had a direct relationship to sensitivities to special senses like sight, hearing, taste and touch, with a notable finding that all people with sensitive teeth expressed a need to wear sunglasses when outdoors.
Stimulation of cells in tiny tubes located in the tissue found beneath the hard enamel that contains the inner pulp is the cause of tooth sensitivity. Beverages which are very hot or very cold, clenching or grinding of teeth or brushing too hard may irritate the inner tubes and increase sensitivity.
Doctors suggest that people with sensitive teeth can find relief from this condition by using special toothpaste or by drinking tea. Tea contains tannic acid which clogs the material in the open dental tubes, making it hard for hot and cold temperatures to seep in and hit the pulp, which is what causes the pain.”
Hope some of this quotations lead you into some beneficial research....