Inconveniently, many commercial mouthwashes are highly acidic and, if used too regularly, can erode dental enamel.
If you're constantly swigging mouthwash to keep your breath fresh, you might want to consider other options, such as brushing more frequently and getting regular dental cleanings.
Tooth enamel can be thinned out by acidic foods. These include, Citrus fruits, juices, pineapples, vinegar, carbonated drinks, some sports drinks, & vinegar-based salad dressings.
There is no need to eliminate all of these from your diet, but sipping water after eating or drinking them is a good suggestion.
Coffee may provide health benefits, but it's hard on teeth. Two or three coffees a day exposes tooth enamel to a staining agent.
Unless these stains are rinsed and brushed away on a regular basis, the enamel of your teeth can become yellowed as a result.
When you smoke, the chemicals in cigarettes and pipe tobacco stick to your teeth, and the more often you smoke, this stains your teeth.