Even though sugar itself does not contain high levels of acidity, it promotes the growth of acid-creating bacteria in your mouth, creating an acidic environment. Stomach acid, vomiting and reflux also can cause serious tooth damage when stomach acid comes into contact with your teeth.

Lemons are a good source of vitamin C but lemon juice is highly acidic and can cause erosion in tooth enamel over time. If you sweeten that lemon water with sugar, you increase the risk of tooth decay as well. ... Rinse your mouth with plain water after drinking. 

9 WAYS TO KEEP ACID REFLUX FROM DAMAGING YOUR TEETH

1. Good dental care See your dentist every six months for a full cleaning and checkof your enamel. Brush and floss as directed every day, and alert your dental specialist 

2. Keep your acid reflux under control 

This starts with a visit to your gastroenterology specialist. Your doctor can advise you on ways to control your acid reflux so the acid can’t get to your teeth in the first place. You may be asked to lose weight, avoid acidic foods, eat smaller meals, sleep propped up,refrain from lying down right after eating, quitting smoking, and reducing alcohol intake

3. Review your diet

What you’re eating could be causing you undue stress. Cut back on the sodas, citrus fruits and drinks,and even pasta sauce. Or, you can switch to low-acid orange juice, for example.

4. Drink through a straw 

If you must drink soda or juice, use a straw so the liquid bypasses your teeth.

5. Chew only sugar-free gum to reduce the amount of acid in your mouth.

6. Avoid brushing your teeth immediately after an acidic meal.

Wait an hour or so, then brush with a soft tooth brush. That’s because acidic foods tend to soften the enamel, and you don’t want to start brushing hard against soft enamel.

7. Choose a fluoride toothpaste and mouthwash for sensitive teeth.

Best dental Specialist will advised recent advanced dental treatment such as topical fluoride therapy or full mouth treatment.

8. Eat a piece of cheese or glass of milk after your meal, to cancel out the effects of the acid.

9. Swish your mouth with water after eating or drinking.10. Drink plenty of water all day long, particularly if you suffer from dry mouth.