At a recent dental check up, I received a nasty shock when my dentist informed me that my daily 'healthy' habit had caused enamel erosion.
The dentist revealed she'd seen a huge rise in similar cases in young women thanks to the drink's growing popularity, even having to give one 21-year-old a set of veneers because of the severe damage it had caused.
A spokesperson for the British Dental Association (BDA) confirmed this with HuffPost UK Style: "Lemon juice is a popular drink in the morning but unfortunately it is highly acidic (with a pH between 2 and 3) and therefore can contribute to enamel erosion or tooth wear over time.
"The temperature of the water can also make a difference, erosion is more severe at higher temperatures."
They recommend swapping the hot water with lemon for coffee or tea in the morning as they're kinder to teeth - although take care with herbal teas as the fruit-based versions are often acidic.
The BDA also warned that if you're adding sugar or honey to your lemon water, it can have a "double whammy effect" on teeth.
"Lemon juice can cause erosion and sugar increases the risk of tooth decay," they said.
If you really can't go without your lemon-y fix, they suggest having it as an occasional treat - drinking it through a straw to avoid contact with teeth, diluting it as much as possible, and only consuming the drink at meal times.