I'm Karen, the Fixodent Community Manager. I know this must be extremely frustrating. If your gums are still healing from your extractions, future adjustments and/or relines may provide for a better fit. Also, it takes time for the muscles of your cheeks, lips and tongue to learn to keep your lower denture in place. Still, dental implants are an option, as they are fixed solidly in the bone. Keep in mind that dental implants require surgical procedures which usually include a small amount of discomfort, and it can take some time for the implants to heal in the bone.
Does anyone have dental implants? If so, please post to let us know your experiences. We'd love to hear from you!