Is it harmful to get a tetanus booster shot before 10 years...

Question: 

Is it harmful to get a tetanus booster shot before 10 years have passed since your last shot?

Answer: 
Getting a tetanus booster dose early is not harmful. However, booster doses of tetanus-containing vaccines given too frequently may cause an increased local reaction. Your immunizing health care provider can make a recommendation for you.
 
- Immunization Nurse