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4d hifu uses the power of high intensity focused ultrasound to safely lift and tighten skin. over the next 90-180 days, the wound-healing response stimulates long-term tissue and leads to further lifting and tightening, with results that can last years. the vagina tightening hifu system uses an noninvasive ultrasonic focusing technique to focus on the mucous membrane fibrous layer and muscle layer directly. therefore, the desired depth layer can obtain the ideal effect of collagen concentration, reorganization and regeneration. ultimately, the mysterious effect of vagina tightening is achieved..syi