I send you now a short abstract from ConsumerLab

Due to their acidity, frequent consumption of lemon juice, orange juice and other citrus juices, as well as beverages such as Crystal Light, can contribute to the erosion of tooth enamel (Reddy, J Am Dent Assoc 2015). Lemon juice may be the worst culprit (Zimmer, PLoS One 2015), and several varieties of Crystal Light have been ranked as “erosive” or “highly erosive” to tooth enamel (Reddy, J Am Dent Assoc 2015). To minimize the effects of acidic beverages on tooth enamel, the American Dental Association (ADA) recommends drinking through a straw positioned behind the front teeth to help avoid exposing teeth to acidic beverages. The ADA also warns that you should not brush your teeth immediately after drinking — rinse the mouth with water and wait a half hour to one hour before brushing.