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What is According to Finn, the best method of brushing for mixed dentition: and explain in detail?
The four basic methods of tooth brushing are:

Horizontal reciprocating (Scrub method)
Vertical sweeping (Roll and physiologic methods)
Circular (Fones method)
Vibratory (Charters, Bass and Stillman methods)

Key Concept:
Brushing Technique used commonly in children 
The circular brushing method or Fone’s technique is a natural brushing method to use with young children who want to do their own brushing, but do not have the muscle development for techniques that require more co-ordination.