Cucumber and Egg Yolk. Another excellent remedy for lifting the breasts is a mask prepared from cucumber and egg yolk. Cucumber has natural skin-toning properties and egg yolk has high levels of protein and vitamins that can help treat sagging breasts. Puree 1 small cucumber in a blender. Mix in 1 egg yolk and 1 teaspoon of butter or cream to get a paste. Apply it onto your breasts and leave it on for about 30 minutes. Wash it off thoroughly with cold water. Use this mask once a week to firm and strengthen the breast tissues.