Leading dentist near Velachery | How Much Toothpaste Should You Use? Using the right amount of toothpaste is key to maintaining good oral hygiene. For adults, a pea-sized amount is sufficient to clean effectively and prevent overexposure to fluoride. For children under three, a smear the size of a grain of rice is recommended. Using excessive toothpaste can lead to unnecessary fluoride ingestion or waste. At Dr. Akkshaya Dental & Aesthetics, we provide personalized guidance to help you maintain your oral health.