Anterior sickle scalers are designed to be used on anterior teeth.[5] Typically, they are constructed with one working-end and are categorized as single-ended instruments.[5] As well, they may be combined to produce a double-ended instrument with two working ends on both sides.[5] Posterior sickle scalers may be used on both anterior and posterior teeth.[5] The working ends are designed to be opposite images of one another, therefore, two posterior sickle scalers are combined to produce a double-ended instrument.[5]