EZO holds upper and lower dentures tight with VACUUM GRIP. When dentures are new, they grip with a natural vacuum. Over time, gums can recede and dentures can slip. EZO denture cushions help recreate the natural vacuum that keeps dentures in place. Made of pure cotton flannel, paraffin wax and corn oil, EZO denture cushions add extra cushioning with no bad taste or odor and last up to 24 hours.