*Clinical Concepts and Practical Management Techniques in Dentistry*

small communities that are difficult to reach dur to cultural professional or other reasons.

Snowball sampling is also sometimes referred to as chain-referral sampling. Snowball sampling is low-cost and easy to implement. Snowball sampling is lowcost and easy to implement. It does not require a research team to hire recruiters for the study since the initial subjects act as the recruiters who bring in additional subjects. The disadvantage is that sampling bias can occur because, when initial subjects recruit additional subjects, it is possible that several subjects may share similar characteristics or characteristics that may not be representative of the broader population under research (**Figure 8**) [37].
