Hydrogen peroxide, including products like Criticure's 100 ml, is sometimes used as a mouthwash in diluted form to help with minor mouth irritations or to reduce bacteria. However, it is very important not to use it undiluted, as concentrated hydrogen peroxide can irritate or damage the delicate tissues inside your mouth.

If you are considering using hydrogen peroxide as a mouthwash, it should be diluted properly—typically a 3% solution diluted with equal parts water is used safely. Always avoid swallowing it, and do not use it frequently or for prolonged periods without consulting a healthcare professional.

If you have any mouth sores, gum disease, or other oral health concerns, it is best to discuss with your dentist or doctor before using hydrogen peroxide mouthwash. They can recommend the safest and most effective treatment for your situation.

In summary, while diluted hydrogen peroxide can be used as a mouthwash, using Criticure's 100 ml hydrogen peroxide directly without dilution is not recommended. Always follow product instructions and seek professional advice if unsure.