My boy refuse to brush his teeth with any toothpaste except for First Teeth. He complains that the rest is too 'hot' even the mildest Kodomo Strawberry flavour. I gave up and just let him brush with water. Is brushing with just water alright?

How old is your son? It is advised that children above 3 years of age use fluoride toothpaste. First Teeth has no fluoride. I guess the only way out is to try all the different brands until he finds one that is ok. A trip to the dentist may also help. Kids always listen to their doctors, teachers more than us parents.