is lemon beneficial for my child   

Lemon water is not suitable for a child’s oral health, and it will impact the child’s enamel which protects their teeth from hot and cold temperatures and chewing, biting, grinding, crunching and more. If your child insists on having it give it with a straw, so while drinking, the lemon water goes directly into the throat rather than sitting in the mouth. Also, wash it with plain water and rinse out the mouth, do not brush the teeth immediately after having lemon water.