No, DenSureFit is not permanent, but it can last up to 3 months. Generally, the product needs to be replaced every 2 months in order for the user to experience optimal performance. Depending on how often you wear your dentures, your particular oral environment (including food choices), and other personal factors like anatomy or medical issues, you may need more frequent replacements for an optimum fit – however this will depend heavily on individual preferences and comfort level as well.