To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is
(a) acidic
(b) neutral
(c) basic
(d) corrosive
Answer: (c)
The tooth paste commonly used is basic so that the extra acid formed during tooth decay is neutralised and prevent tooth decay.
When pH of our mouth falls below 5.5 due to eating of sweets etc, (ie, our mouth is moderately acidic) then the acid becomes strong enough to attack the enamel which is made up of calcium phosphate of our teeth and corrodes it which leads to tooth decay.