can't say i noticed it when i was on it. the thing i got was achiing muscles and joints - aching ot ehte point i could barely move without shooting pain going up and down my body.
it, and other drugs of its type (epilepsy anti-seizure ones) sometimes work by altering the absorption of certain minerals by the body - it's possible that this mechanism does damage to the teeth either directly (the altered absorption of the mineral itself) or indirectly (the altered absorption changes how something else in the body works).
if you are female and also on the pill, your teeth will get bad because the excessive hormone levels produced make your body produce more plaque.
if you've been on both for the same amount of time, chances are better that it's the pill causing your problems.
i was on lamotrigine for 3 years.
oh my giddy aunt - sorry about the typos!
"aching" "to the point"