No, no, I'm serious.
If you've got a "sour tooth" instead of – or worse yet in addition to – your sweet tooth, be careful. Eating that lemon slice out of your water glass or the wedge garnishing your plate throws a heavy dose of acid on the surface of your teeth which will eat away the enamel. The enamel, as you may recall from grade school, is the layer of armor your brave teeth wear to protect them from attack.
Knock off eating lemons like apples unless you like expensive prescription toothpaste and your dentist saying "well, all those painful spots may be cavities, but also use this second prescription calcium paste for a month and we'll see if we have to drill".