People who have undergone tooth whitening procedures may be surprised to hear that mouthwash can actually damage teeth.
According to professor of restorative dentistry at Newcastle University Robin Seymour, some solutions can have an adverse affect on the mouth if used too frequently, the Daily Mail reports.
Many products contain alcohol, which Mr Seymour suggested can be very problematic.
The presence of alcohol in the mouth can cause it to dry out and this can often lead to bad breath, while some mouthwashes can stain the teeth.
It has also been said that certain brands do not react well with toothpaste and sometimes the use of mouthwash can undo all of the cleaning work done by the paste.
A study published in the Dental Journal of Australia in 2009 showed that mouthwash could potentially increase the likelihood of developing oral cancer.
Some people may also find they are allergic to the fluid and last month, dental patient Sacha Rumaner died during an appointment at a Brighton practice after suffering a reaction to mouthwash.