$\text{1. }$ We should go to the dentist twice a year 

$\rightarrow$ màu đỏ 

$\text{2. }$ A dentist can examine our teeth and fill the small in our teeth ( before they destroy the teeth ) 

$\rightarrow$ màu xanh nước biển 

$\text{3. }$ We should brush our teeth at least twice a day once after breakfast and once before we go to bed 

$\rightarrow$ màu xanh lá cây 

$\text{4. }$ Milk, cheese, fish, potatoes, red rice, raw vegetables, and fresh fruit 

$\rightarrow$ màu đen 

$\text{5. }$ Chocolate and sweets are bad for our teeth because they stick our teeth and cause decay 

$\rightarrow$ màu nâu 

1. Twice a year.

( First, we should visit our dentist twice a year )

2. He can examine our teeth and fill the small holes in our teeth before they destroy the teeth.

( He can examine our teeth and fill the small holes in our teeth before they destroy the teeth )

3. At least twice a day one after breakfast and once before we go to bed.

( Secondly, we should brush our teeth at least twice a day one after breakfast and once before we go to bed )

4. They are milk, cheese, fish, potatoes, red rice, raw vegetables and fresh fruit.

( Thirdly, we should eat food that is good for our teeth and our body such as milk, cheese, fish, potatoes, red rice, raw vegetables and fresh fruit )

5. Because they stick to our teeth and cause decay.

( Chocolate, sweets, biscuits and cakes are harmful because they stick to our teeth and cause decay )