Overusing them
While cloves offer numerous health benefits, consuming too much can backfire. One or two cloves daily is a reasonable amount. Everything above that number may upset your stomach and stress your liver due to excess eugenol. A with any other food out there, moderation is key.
Combining Cloves with Diabetes Medication

Because they help reduce the levels of sugar in the blood, combining them with medications such as insulin or metformin — which serve the same purpose — may lower your blood sugar too much. This can lead to dizziness, weakness, and confussion.
Replacing Dental Care with Clove Use
Cloves can temporarily relief a toothache, but they don’t treat the underlying cause. Prolonged use without dental care may lead to complications so only use them as a temporary remedy.