When enamel on surface of tooth comes in contact with acid in food or is excessively worn, it softens and dissipates. There are two causes of enamel erosion or acid erosion:
Normal enamel is transparent but if teeth become thinner and more yellow or turns opaque, it means that the enamel has started to erode. See a dentist as soon as possible for diagnose.
As for common tooth stains caused by coffee or tea, color distribution is uneven but could be caused by thinning enamel. It is difficult to distinguish the extent of the damage. If this occurs, make an appointment to see your dentist for a checkup.
Proper use of a suitable toothbrush and paste helps to protect the enamel. Remember to gargle with water after a meal. Studies have shown that bacteria and food debris in mouth causes plaque on tooth surface within 20 minutes after eating. The best way to fight plaque is to brush your teeth thoroughly in the morning and evening. Use a soft toothbrush to gently brush each tooth. Use sensitive toothpaste to improve brushing results and relieve tooth pain without causing wear. Understanding the content of your diet also helps mitigate tooth sensitivity. How much acid do you take in? Cut down if you consume too much acidic food. Drink an acidic drink with a straw to avoid contact with teeth to reduce erosion. Consult a dietitian for a dietary assessment and advice if required.