For sparkling teeth, mix one teaspoon of fresh lemon juice with one teaspoon of bicarbonate of soda and half teaspoon of salt. Use like toothpaste – once a week. Lighten the skin and smoothens rough edges of elbows and knees. Cut a lemon into two halves and rest your elbows in each half for 15 minutes. Or squeeze juice of lemon and apply on your knees.