in this study investigator evaluate the effectiveness of breathing exercise using two different play toys in reducing dental anxiety.
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Heart rate to assess child's dental anxiety
Timeframe: during dental treatment after local anesthetic injection. Heart rate is measured in beats/min measured twice, first before any dental treatment and measured a second time after 7-10 minutes after injection of local anesthesia
Venham picture test used to assess dental anxiety
Timeframe: during dental treatment recorded before any treatment is done and after five minutes of injection of local anesthesia
Salivary Alpha amylase
Timeframe: before any dental treatment is done and 7-10 minutes after injection of local anesthesia