Is a dentist needed for a green color crack in front teeth?

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Yes, you need to visit your dentist as early as possible. Those green lines are basically a form of "calcified plaque or calculus" in medical term and the reason behind their green color can be chromogenic bacteria.

These plaques are needed to be removed at the earliest otherwise they will become much more heavy in bulk and will degrade the underlying bone which is supporting your tooth and in advanced stages it may lead to tooth mobility, gum recession and in severe cases it can even lead to loss of tooth.

But, you do not have to worry about that cause your disease is already diagnosed. What you need is oral prophylaxis and dental scaling from your dentist to get rid of those greenish lines. Post prophylaxis polishing is required.

I generally prescribe Chlorhexidine 0.2% oral rinse or mouthwash twice daily for seven days. Nothing per mouth for 15 minutes after your rinse using this solution. Never swallow the solution. In case of an allergic reaction to this drug avoid or stop the medication and visit your nearby dentist. However, allergic reactions to this medication are very rare as per my experience.

You also need to brush your tooth daily with a soft toothbrush and toothpaste and you must brush your tooth twice a day after breakfast and after dinner to maintain your oral hygiene.