Hello, Lemon juice has been used traditionally for cleansing skin, losing weight, and may other benefits. However, there are some side effects of the daily use of the lemon juice due to acidic content of the lemon. Firstly, as lemon is very acidic and has low pH, it can cause heartburn or acidity. In addition, direct contact of the concentrated lemon juice with tooth can erode the enamel of the tooth making them abraded and susceptible to decay. It addition, sometimes people experience stomach upset, kidney problems, stomach ulcers etc. with daily use of the lemon. Thus, you can use it everyday if you want to, but do keep the side effects in mind so that you can stop use of lemon juice as soon as you observe any. I hope this information helps. Thank you for choosing HealthcareMagic. Let me know if you have further questions. Best, Dr. Viraj Shah