i think mint comes from the oil they use, i think put a ton of it in the newer version of crest/colgate or another to mask the cheapness of the less effective ingredients. some people says SLS(sodium laurel sulfate/sarscoinate), or CLS causes it. but i think its the mint oil, or abrasives. i get ulcers when i use one of these toothpastes. i use the ones with potassium nitrate(to numb teeth)