There's an ongoing research right now, testing the effectivity of gargling tea instead of the commercial mouthwash to reduce the build up of plaque on the teeth.

So, try rinsing your mouth with tea instead of the commercial mouthwash before going to bed.
In India, a study will be organized to see how green and black tea will compare to the effectivity of the commercial antiseptic in addressing oral problems.

The experiment will involve 45 people with gingivitis, a gum disease that manifests bleeding in the gingiva. They will be given the teas to serve as a mouthwash containing chlorhexidine , it will be used for 30 seconds each day after brushing.

Scientists believe that tannin found in tea may contain antibacterial properties. Sri Hasanamba Dental College and Hospital in India will carry out the two week trial.

Green tea has been used for medical purpose for years. It has been added to many types of beauty and health products in the recent years. However, it seems like one of it's most common and best use is as a gargle. Using fresh green tea for a gargle solution is a most effective way of killing potential bacterial growth.

Here's how you can prepare your own concoction of this tea rinse.  For a stronger solution, use a loose leaf like gun powder or Japanese sencha. Brew it as you would your drink, allow to cool to a comfortable temperature for rinsing.

Tannin was an astringent, is a bitter plant containing polyphenolic compound that binds to and precipitates proteins and various other organic compounds including amino acids and alkaloids.

Plaque on the other hand is that sticky, colorless film of bacteria that forms on the teeth. It is most noticeable when the teeth are not brushed and makes the teeth "feel fuzzy" to the tongue.

It develops when foods containing carbohydrates, sugars and starches found in milk, soft drinks, raisins, cakes, or candy are frequently left on the teeth.

Acids result from bacteria that live in the mouth that thrive on these foods. Over a period of time, when the build up of this acids is not addressed with mouth care, it can destroy tooth enamel, resulting in tooth decay.

Plaque can also develop on the tooth roots under the gum and cause the breakdown of the bone supporting the tooth, a condition called periodontitis.