All the questions that you didn’t know you should be asking.

We all have questions about the products we buy, but sometimes we don’t know what to ask. We asked our team of Scientists, Engineers, and Dentists; “What questions should customers be asking about their oral rinse? From their responses, we created our Frequently Asked Questions page to help guide you in selecting your oral rinse.

Burning and cleaning

Why does my other oral rinse cause a burning sensation in my mouth?

  • A burning mouth during use of oral rinse is associated with alcohol in the product. Synedent & Synedent FLX are Alcohol Free and therefore no burning sensation is associated with its use.
  • Synedent & Synedent FLX are scientifically formulated to clean your mouth without the use of harsh chemicals like alcohol or certain essential oils that cause a burning sensation and leave a bad taste in your mouth.

Is this burning required for cleaning?

  • No, there are many ways to clean your mouth without burning. You don’t use soap that burns your skin, do you? The mucosal surfaces in your mouth are even more sensitive than your skin.
  • Be kind to your mouth and choose a mouthwash without the burn that leaves your mouth feeling moist and refreshed.

Should I be worried about this burning when I use oral rinse?

  • We recommend using Synedent & Synedent FLX, an alcohol free, non-burning oral rinse.
  • Alcohol is a drying agent, which can lead to dry mouth which can contribute to bad breath and a bad aftertaste.
  • Total alcohol consumption and frequency of exposure have been shown to be detrimental to oral health.

What’s Not Included

What doesn’t Synedent and Synedent FLX contain?

  • NO Sodium Lauryl Sulfate, NO Sodium Lauroyl Sarcosinate: These detergents are used to increase the foaming of soaps, rinses, and shampoos. Synedent contains Polysorbate 20 which acts primarily as an emulsifier but also creates some foaming to help with oral cleaning without a soapy or bitter after taste.
  • NO Alcohol: Alcohol is a drying agent that can lead to dry mouth, which can contribute to bad breath and a bad aftertaste.
  • NO Parabens: This family of preservatives is added to cosmetics to increase their shelf life. You will not find them in Synedent.
  • NO Chlorhexidine: This antibacterial drug is added to prescription oral rinses. It has an unpleasant taste and can stain teeth.
  • NO Triclosan: This antibacterial compound currently under review in the US and Canada for safety. There are also environmental concerns for the health of our rivers, lakes, and oceans.
  • NO Hydrogen Peroxide: This antiseptic can harm oral and gut mucosa with frequent use and may etch teeth.
  • NO Zinc: Zinc is a metal that is not found in Synedent.
  • NOT Acidic and NOT Basic: Synedent and Synedent FLX were scientifically formulated with a balanced pH to avoid acidic and basic conditions that damage teeth and oral mucosa.

Can an oral rinse clean your mouth without these questionable extra ingredients?

  • YES! Synedent and Synedent FLX were formulated to clean your teeth and mouth without the addition of these harsh chemicals, antibiotics, and metals with a balanced pH that is gentle on teeth and oral tissues.


Why does my other oral rinse taste bad?

  • There are many reasons an oral rinse can taste bad, but all bad tastes are caused by the oral rinse’s ingredients and how they interact with each other in your mouth.
  • Alcohol can often create a bad taste, drying of your taste buds and a burning sensation in your mouth that can change how you perceive tastes.
  • Natural oils extracted from plant leaves, spices, and peels of fruits can be too concentrated for our tongues creating a harsh flavor. Many oral rinses mix several oils or extracts together to add flavor, create cooling sensations, or to claim that they have many “natural oils” to imply they must therefore be healthy. We find that mixtures of natural oils or extracts can create unintended bad flavors. Synedent & Synedent FLX contain only peppermint oil to produce a familiar fresh minty taste. This oil is very safe and has been used for decades to flavor oral care products and food. Our peppermint oil was carefully selected for Synedent & Synedent FLX after testing many different manufacturers’ peppermint oils for flavor and quality.

Does my oral rinse need to taste like medicine?

  • No, medicinal tastes may come from natural oils, phenolic compounds, alcohol, or hydrogen peroxide.