The layer(s) of tooth is/are

Which one of the following are added to make bread and cakes fluffy?

Teeth being to appear at the age of

Fill in the blank.
Sugar + Plaque = __________

Which kind of teeth is well developed in herbivores?

In the above diagram tooth marked II represent:

The soft, sticky layer formed on the tooth which is harmful is

The teeth that are used for cracking hard food are

In the above diagram, teeth marked I represent:

Raju buried a dead rat under the soil. When he dug up one year later, he found that it had decayed. Which one of the following is responsible for the decay?