Sewer gas from toilet

Sometimes the water level in the toilet bowl drops below the trap letting sewer gas into the bathroom. How can the water level be raised in the bowl? Why is it that sometimes the level is low--this has happened recently and the toilet has been working fine the past 15 years. TIA
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Phisherman wrote:

Something's changed in your vent stack. Bird's nest, dead animal, back flush clog, or something. Your water is getting siphoned out. Check your vents. Bowl water height is determined by the trap design. Make sure the "fill pipe" is connected to the overflow in the water tank.
--
Grandpa

What is that dripping from my fingers?
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Phisherman wrote:

You don't need to raise the water, rather you need to keep it from going down. Most of the time when this happens there is a fully or partly blocked vent. You may also have a partly blocked drain.
--
Joseph Meehan

Dia duit
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odd mine did that awhile ago then one dthe problem went away/
in my case its probably a clog.
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