Heterobasidiomycetes, including the jelly, rust and smut fungi; Previously the entire Basidiomycota were called Basidiomycetes, an invalid class level name coined in 1959 as a counterpart to the Ascomycetes, when neither of these taxa were recognized as divisions.
Too much of anything is bad is general rule of thumb. I found several articles which favour eating peppermint and detail side effects of over consumption. But in general there are some side effects of eating altoids and other mint gums. Mouth sores, headaches, stomach burns are few of them. Check out following links for more information. peppermint: Uses, Side Effects, Interactions and Warnings.
Peppermint tea helps settle the stomach by calming the muscles of the stomach and improving the flow of bile and can relieve other stomach issues such as menstrual cramps and abdominal gas. And licorice tea can help protect your stomach from ulcers that can cause abdominal pain, bloating, and indigestion.