Difference between "have to" and "will have to"?

[Kjsivakumar]

Hello Hi

I got one doubt about model verbs "have to".

what is the difference between "have to" and "will have to"?
where ll we use these two things?

Please kindly tell me with Example

thanks
sivakumar

[Kitosdad]

I will have to go to the dentist (soon) as my tooth is aching.

I have to go to the dentist. (now) The pain is unbearable.
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[Basu]

Sir may name is Basu still I am confuse when use –have been, had been, has been

[Rfaleet]

we use have/has in present.The pronouns (he,she,it) has and(we,they,you,I) have.
He has been to London.
she has been to Paris.

I have been to America.

We use( had) in the past with all pronouns.
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