Too, Enough - Infinitives of purpose.

Use not enough when something is less than what you want.

Use enough when something is exactly what you want.

Use too when something is more than what you want.

Write enough after the adjective: Juan is young enough.

Write too before the adjective: Juan is too young.

Alexader is not old enough to live alone.

Alexander is too young to live alone.

I see a dentist to check my teeth.

We go to bed to cure a headache.

I see a dentist in order to check my teeth.

We go to bed in order to cure a headache.