It usually starts in the nerves farthest from the brain and spinal cord -- like those in the feet and hands. Then it may move up into the legs and arms. However, if you get treatment for the medical condition causing the nerve damage, you may be able to stop the damage -- and even reverse it.
If swallowed, tea tree oil can cause varying side effects ranging from drowsiness, upset stomach, vomiting, nausea and weakness, to coma, hallucinations, blood cell abnormalities, confusion and ataxia which affects muscle coordination and your ability to move voluntary muscles, states the American Cancer Society.
1 Gingivitis. 2  Results from research examining the effects of tea tree oil on gingivitis are inconsistent. 3  Some early research shows that brushing the teeth with a 2.5% tea tree oil gel twice daily for eight weeks reduces gum bleeding but does not improve overall gum health in people who have gingivitis caused by plaque.