The specific aims of the project are to determine whether hand/wrist, forearm/elbow and shoulder symptoms (e.g., pain, fatigue, paresthesias) and hand function are less severe among dentists and dental hygienists who use a new dental tool in comparison to those who use a more conventional tool for performing scaling. One hundred twenty (120) subjects will be randomized to use one of 2 handle designs for a 4 month period and during this time will perform their usual dental scaling work with the new tools. The effects on outcome measures will be adjusted for potential covariates (e.g., age, gender, hours scaling per week, etc.). The primary null hypothesis is: there is no difference in change in pain severity between subjects who use a new tool in comparison to those who use a conventional tool.